Fixed list loop caused when there are two entries in the list and the one...

Fixed list loop caused when there are two entries in the list and the one being returned is already at the head.

src/render/opengles2/SDL_render_gles2.c

@@ -470,7 +470,7 @@ GLES2_CacheProgram(SDL_Renderer *renderer, GLES2_ShaderCacheEntry *vertex,
     }
     if (entry)
     {
-        if (rdata->program_cache.count > 1)
+        if (rdata->program_cache.head != entry)
         {
             if (entry->next)
                 entry->next->prev = entry->prev;