Copter: correct compilation when rally disabled

ArduCopter/Log.cpp

@@ -923,7 +923,9 @@ void Copter::Log_Write_Vehicle_Startup_Messages()
     sprintf(frame_buf, "Frame: %s", get_frame_string());
     DataFlash.Log_Write_Message(frame_buf);
     DataFlash.Log_Write_Mode(control_mode, control_mode_reason);
+#if AC_RALLY
     DataFlash.Log_Write_Rally(rally);
+#endif
 }
 
 

ArduCopter/config.h

@@ -656,9 +656,10 @@
 
 #ifndef AC_TERRAIN
  #define AC_TERRAIN ENABLED
- #if !AC_RALLY
-  #error Terrain relies on Rally which is disabled
- #endif
+#endif
+
+#if AC_TERRAIN && !AC_RALLY
+ #error Terrain relies on Rally which is disabled
 #endif
 
 //////////////////////////////////////////////////////////////////////////////