avformat/rtmphttp: fix bug for rtmphttp

if the http server don't response the http command,
then the thread will be blocked and never be interrupted.
Reported-by: yinyunjiang <yinyunjiang1991@qq.com>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/rtmphttp.c

@@ -208,7 +208,7 @@ static int rtmp_http_open(URLContext *h, const char *uri, int flags)
     }
 
     /* alloc the http context */
-    if ((ret = ffurl_alloc(&rt->stream, url, AVIO_FLAG_READ_WRITE, NULL)) < 0)
+    if ((ret = ffurl_alloc(&rt->stream, url, AVIO_FLAG_READ_WRITE, &h->interrupt_callback)) < 0)
         goto fail;
 
     /* set options */