Seek back to start on error

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401333

src/video/SDL_bmp.c

@@ -318,6 +318,9 @@ SDL_Surface * SDL_LoadBMP_RW (SDL_RWops *src, int freesrc)
 	}
 done:
 	if ( was_error ) {
+		if ( src ) {
+			SDL_RWseek(src, fp_offset, SEEK_SET);
+		}
 		if ( surface ) {
 			SDL_FreeSurface(surface);
 		}