fix warnings

examples/widgets/chart/lv_example_chart_3.c

@@ -8,7 +8,7 @@ static void draw_event_cb(lv_event_t * e)
 
     if(dsc->id == LV_CHART_AXIS_PRIMARY_X && dsc->text) {
         const char * month[] = {"Jan", "Febr", "March", "Apr", "May", "Jun", "July", "Aug", "Sept", "Oct", "Nov", "Dec"};
-        dsc->text = month[dsc->value];
+        lv_snprintf(dsc->text, dsc->text_length, month[dsc->value]);
     }
 }
 

src/extra/libs/png/lodepng.c

@@ -2552,6 +2552,8 @@ unsigned char* lodepng_chunk_find(unsigned char* chunk, unsigned char* end, cons
     if(lodepng_chunk_type_equals(chunk, type)) return chunk;
     chunk = lodepng_chunk_next(chunk, end);
   }
+
+  return 0; /*Shouldn't reach this*/
 }
 
 const unsigned char* lodepng_chunk_find_const(const unsigned char* chunk, const unsigned char* end, const char type[5]) {
@@ -2560,6 +2562,8 @@ const unsigned char* lodepng_chunk_find_const(const unsigned char* chunk, const
     if(lodepng_chunk_type_equals(chunk, type)) return chunk;
     chunk = lodepng_chunk_next_const(chunk, end);
   }
+
+  return 0; /*Shouldn't reach this*/
 }
 
 unsigned lodepng_chunk_append(unsigned char** out, size_t* outsize, const unsigned char* chunk) {