print AVCodecContext address instead of AVClass, better when multiple...

print AVCodecContext address instead of AVClass, better when multiple instances of same codecs are used, based on r14237

Originally committed as revision 14255 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffserver.c

@@ -348,7 +348,7 @@ static void http_av_log(void *ptr, int level, const char *fmt, va_list vargs)
     if (level > av_log_level)
         return;
     if (print_prefix && avc)
-        http_log("[%s @ %p]", avc->item_name(ptr), avc);
+        http_log("[%s @ %p]", avc->item_name(ptr), ptr);
     print_prefix = strstr(fmt, "\n") != NULL;
     http_vlog(fmt, vargs);
 }