qtcapture: Don't release objects when libvlc quit, else we may loose our main...

qtcapture: Don't release objects when libvlc quit, else we may loose our main thread, and dead lock.

modules/access/qtcapture.m

@@ -317,10 +317,16 @@ static void Close( vlc_object_t *p_this )
     demux_t     *p_demux = (demux_t*)p_this;
     demux_sys_t *p_sys = p_demux->p_sys;
 
+    /* Hack: if libvlc was killed, main interface thread was,
+     * and poor QTKit needs it, so don't tell him.
+     * Else we dead lock. */
+    if( vlc_object_alive(p_this->p_libvlc))
+    {
         [p_sys->session stopRunning];
         [p_sys->output release];
         [p_sys->session release];
         [p_sys->device release];
+    }
     free( p_sys );
 
     [pool release];