Update IMG_png.c

Author: Starbuck5

src/IMG_png.c

@@ -231,6 +231,7 @@ int IMG_isPNG(SDL_RWops *src)
 }
 
 SDL_Surface *IMG_LoadPNG_RW(SDL_RWops *src) {
+    Sint64 start;
     png_image image;
     Sint64 src_length;
     Uint8* raw_image_buffer;
@@ -283,7 +284,7 @@ SDL_Surface *IMG_LoadPNG_RW(SDL_RWops *src) {
 
     int objects_read = SDL_RWread(src, raw_image_buffer, 1, src_length); // ec
 
-    printf("objects_read=%i\n", objects_read);
+    //printf("objects_read=%i\n", objects_read);
 
     if (lib.png_image_begin_read_from_memory(&image, raw_image_buffer, src_length)) {
         /* If the image is natively encoded with a colormap, set the format to