clang-tidy param avoid malloc(0)

.clang-tidy

@@ -16,9 +16,9 @@ Checks:          '*
 		,-clang-analyzer-optin.performance.Padding
 		,-clang-analyzer-security.FloatLoopCounter
 		,-clang-analyzer-security.insecureAPI.strcpy
-		,-clang-analyzer-unix.API
 		,-clang-analyzer-unix.cstring.BadSizeArg
 		,-clang-analyzer-unix.Malloc
+		,-clang-analyzer-unix.MallocSizeof
 		,-cppcoreguidelines-c-copy-assignment-signature
 		,-cppcoreguidelines-interfaces-global-init
 		,-cppcoreguidelines-no-malloc
@@ -59,6 +59,7 @@ Checks:          '*
 		,-modernize-use-equals-delete
 		,-modernize-use-override
 		,-modernize-use-using
+		,-performance-inefficient-string-concatenation
 		,-readability-avoid-const-params-in-decls
 		,-readability-else-after-return
 		,-readability-implicit-bool-cast
@@ -66,8 +67,6 @@ Checks:          '*
 		,-readability-named-parameter
 		,-readability-non-const-parameter
 		,-readability-redundant-declaration
-		,-performance-inefficient-string-concatenation
-		,-clang-analyzer-unix.MallocSizeof
 		,-readability-redundant-member-init
 		,-readability-simplify-boolean-expr
 		'
@@ -86,4 +85,4 @@ CheckOptions:
   - key:             readability-function-size.LineThreshold
     value:           '4000'
   - key:             readability-function-size.StatementThreshold
-    value:           '4000'
+    value:           '4000'

src/modules/systemlib/param/param.c

@@ -727,7 +727,14 @@ param_set_internal(param_t param, const void *val, bool mark_saved, bool notify_
 
 		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
 			if (s->val.p == NULL) {
-				s->val.p = malloc(param_size(param));
+				size_t psize = param_size(param);
+
+				if (psize > 0) {
+					s->val.p = malloc(psize);
+
+				} else {
+					s->val.p = NULL;
+				}
 
 				if (s->val.p == NULL) {
 					debug("failed to allocate parameter storage");
@@ -1168,7 +1175,14 @@ param_import_callback(bson_decoder_t decoder, void *private, bson_node_t node)
 		}
 
 		/* XXX check actual file data size? */
-		tmp = malloc(param_size(param));
+		size_t psize = param_size(param);
+
+		if (psize > 0) {
+			tmp = malloc(psize);
+
+		} else {
+			tmp = NULL;
+		}
 
 		if (tmp == NULL) {
 			debug("failed allocating for '%s'", node->name);