Fix sizeof mismatch (cid #1049612)

modules/demux/mp4/mp4.c

@@ -1118,7 +1118,7 @@ static int Control( demux_t *p_demux, int i_query, va_list args )
                 return VLC_EGENERIC;
 
             *pi_int = 1;
-            *ppp_title = malloc( sizeof( input_title_t**) );
+            *ppp_title = malloc( sizeof( input_title_t*) );
             (*ppp_title)[0] = vlc_input_title_Duplicate( p_sys->p_title );
             *pi_title_offset = 0;
             *pi_seekpoint_offset = 0;