handle null pointers: cJSONUtils_GeneratePatchesCaseSensitive

cJSON_Utils.c

@@ -1243,7 +1243,14 @@ CJSON_PUBLIC(cJSON *) cJSONUtils_GeneratePatches(cJSON * const from, cJSON * con
 
 CJSON_PUBLIC(cJSON *) cJSONUtils_GeneratePatchesCaseSensitive(cJSON * const from, cJSON * const to)
 {
-    cJSON *patches = cJSON_CreateArray();
+    cJSON *patches = NULL;
+
+    if ((from == NULL) || (to == NULL))
+    {
+        return NULL;
+    }
+
+    patches = cJSON_CreateArray();
     create_patches(patches, (const unsigned char*)"", from, to, true);
 
     return patches;