Fix sizeof mismatch

modules/demux/avformat/demux.c

@@ -919,7 +919,7 @@ static int Control( demux_t *p_demux, int i_query, va_list args )
                 return VLC_EGENERIC;
 
             *pi_int = p_sys->i_attachments;;
-            *ppp_attach = malloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
+            *ppp_attach = malloc( sizeof(input_attachment_t*) * p_sys->i_attachments );
             for( i = 0; i < p_sys->i_attachments; i++ )
                 (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
             return VLC_SUCCESS;