Fix sizeof mismatch (cid #1049613)

modules/demux/flac.c

@@ -401,7 +401,7 @@ static int Control( demux_t *p_demux, int i_query, va_list args )
             return VLC_EGENERIC;
 
         *pi_int = p_sys->i_attachments;
-        *ppp_attach = xmalloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
+        *ppp_attach = xmalloc( sizeof(input_attachment_t*) * p_sys->i_attachments );
         for( int i = 0; i < p_sys->i_attachments; i++ )
             (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
         return VLC_SUCCESS;