ogg: Use unlikely()

(cherry picked from commit 300b4d59)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/demux/ogg.c

@@ -912,7 +912,7 @@ static int Ogg_FindLogicalStreams( demux_t *p_demux )
                 logical_stream_t *p_stream;
 
                 p_stream = malloc( sizeof(logical_stream_t) );
-                if( !p_stream )
+                if( unlikely( !p_stream ) )
                     return VLC_ENOMEM;
 
                 TAB_APPEND( p_ogg->i_streams, p_ogg->pp_stream, p_stream );