modules/demux/ts.c: replace malloc+memset with calloc

Replace the combination of malloc() and memset() on the same pointer by
one instance of calloc(), which does both.

modules/demux/ts.c

@@ -560,10 +560,10 @@ static int Open( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
 
-    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
+    p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
     if( !p_sys )
         return VLC_ENOMEM;
-    memset( p_sys, 0, sizeof( demux_sys_t ) );
+
     p_sys->i_packet_size = i_packet_size;
     vlc_mutex_init( &p_sys->csa_lock );
 
@@ -1405,11 +1405,10 @@ static int UserPmt( demux_t *p_demux, const char *psz_fmt )
     PIDInit( pmt, true, NULL );
 
     /* Dummy PMT */
-    prg = malloc( sizeof( ts_prg_psi_t ) );
+    prg = calloc( 1, sizeof( ts_prg_psi_t ) );
     if( !prg )
         goto error;
 
-    memset( prg, 0, sizeof( ts_prg_psi_t ) );
     prg->i_pid_pcr  = -1;
     prg->i_pid_pmt  = -1;
     prg->i_version  = -1;
@@ -2191,9 +2190,8 @@ static iod_descriptor_t *IODNew( int i_data, uint8_t *p_data )
     bool  b_url;
     int   i_iod_length;
 
-    p_iod = malloc( sizeof( iod_descriptor_t ) );
+    p_iod = calloc( 1, sizeof( iod_descriptor_t ) );
     if( !p_iod ) return NULL;
-    memset( p_iod, 0, sizeof( iod_descriptor_t ) );
 
 #ifdef TS_DEBUG
     fprintf( stderr, "\n************ IOD ************" );