DataFlash: remove duplicate variables

libraries/DataFlash/DataFlash.cpp

@@ -528,7 +528,6 @@ uint32_t DataFlash_Class::num_dropped() const
 // end functions pass straight through to backend
 
 void DataFlash_Class::internal_error() const {
-//    _internal_errors++;
 #if CONFIG_HAL_BOARD == HAL_BOARD_SITL
     abort();
 #endif

libraries/DataFlash/DataFlash_Backend.h

@@ -122,8 +122,6 @@ public:
     virtual void vehicle_was_disarmed() { };
 
 protected:
-    uint32_t dropped;
-    uint8_t internal_errors; // uint8_t - wishful thinking?
 
     DataFlash_Class &_front;
 
@@ -154,7 +152,7 @@ protected:
     DFMessageWriter_DFLogStart *_startup_messagewriter;
     bool _writing_startup_messages;
 
-    uint32_t _internal_errors;
+    uint8_t _internal_errors;
     uint32_t _dropped;
 
     // must be called when a new log is being started:

libraries/DataFlash/DataFlash_File.cpp

@@ -174,7 +174,6 @@ bool DataFlash_File::log_exists(const uint16_t lognum) const
 {
     char *filename = _log_file_name(lognum);
     if (filename == nullptr) {
-        // internal_error();
         return false; // ?!
     }
     bool ret = file_exists(filename);
@@ -290,7 +289,7 @@ uint16_t DataFlash_File::find_oldest_log()
     // doing a *lot* of asprintf()s and stat()s
     DIR *d = opendir(_log_directory);
     if (d == nullptr) {
-        // internal_error();
+        internal_error();
         return 0;
     }
 
@@ -353,7 +352,7 @@ void DataFlash_File::Prep_MinSpace()
     do {
         float avail = avail_space_percent();
         if (is_equal(avail, -1.0f)) {
-            // internal_error()
+            internal_error();
             break;
         }
         if (avail >= min_avail_space_percent) {
@@ -361,12 +360,12 @@ void DataFlash_File::Prep_MinSpace()
         }
         if (count++ > MAX_LOG_FILES+10) {
             // *way* too many deletions going on here.  Possible internal error.
-            // internal_error();
+            internal_error();
             break;
         }
         char *filename_to_remove = _log_file_name(log_to_remove);
         if (filename_to_remove == nullptr) {
-            // internal_error();
+            internal_error();
             break;
         }
         if (file_exists(filename_to_remove)) {
@@ -380,7 +379,7 @@ void DataFlash_File::Prep_MinSpace()
                     // sequence of files...  however, there may be still
                     // files out there, so keep going.
                 } else {
-                    // internal_error();
+                    internal_error();
                     break;
                 }
             } else {

libraries/DataFlash/DataFlash_MAVLink.cpp

@@ -133,7 +133,7 @@ bool DataFlash_MAVLink::WritesOK() const
 bool DataFlash_MAVLink::_WritePrioritisedBlock(const void *pBuffer, uint16_t size, bool is_critical)
 {
     if (!semaphore->take_nonblocking()) {
-        dropped++;
+        _dropped++;
         return false;
     }
 
@@ -145,7 +145,7 @@ bool DataFlash_MAVLink::_WritePrioritisedBlock(const void *pBuffer, uint16_t siz
     if (bufferspace_available() < size) {
         if (_startup_messagewriter->finished()) {
             // do not count the startup packets as being dropped...
-            dropped++;
+            _dropped++;
         }
         semaphore->give();
         return false;
@@ -306,13 +306,9 @@ void DataFlash_MAVLink::handle_retry(uint32_t seqno)
     }
 }
 
-void DataFlash_MAVLink::internal_error() {
-    internal_errors++;
-    DataFlash_Backend::internal_error();
-}
 void DataFlash_MAVLink::stats_init() {
-    dropped = 0;
-    internal_errors = 0;
+    _dropped = 0;
+    _internal_errors = 0;
     stats.resends = 0;
     stats_reset();
 }
@@ -341,10 +337,10 @@ void DataFlash_MAVLink::Log_Write_DF_MAV(DataFlash_MAVLink &df)
         LOG_PACKET_HEADER_INIT(LOG_DF_MAV_STATS),
         timestamp         : AP_HAL::millis(),
         seqno             : df._next_seq_num-1,
-        dropped           : df.dropped,
+        dropped           : df._dropped,
         retries           : df._blocks_retry.sent_count,
         resends           : df.stats.resends,
-        internal_errors   : df.internal_errors,
+        internal_errors   : df._internal_errors,
         state_free_avg    : (uint8_t)(df.stats.state_free/df.stats.collection_count),
         state_free_min    : df.stats.state_free_min,
         state_free_max    : df.stats.state_free_max,

libraries/DataFlash/DataFlash_MAVLink.h

@@ -151,7 +151,6 @@ private:
 
     void Log_Write_DF_MAV(DataFlash_MAVLink &df);
 
-    void internal_error();
     uint32_t bufferspace_available() override; // in bytes
     uint8_t remaining_space_in_current_block();
     // write buffer