ts demux: fix potential crash in EIT events

modules/demux/ts.c

@@ -2912,12 +2912,15 @@ static void EITCallBack( demux_t *p_demux, dvbpsi_eit_t *p_eit )
                     if( pE->i_text_length > 0 )
                     {
                         char *psz_text = EITConvertToUTF8( pE->i_text, pE->i_text_length );
+                        if( psz_text )
+                        {
                             msg_Dbg( p_demux, "       - text='%s'", psz_text );
 
                             psz_extra = realloc( psz_extra, strlen(psz_extra) + strlen(psz_text) + 1 );
                             strcat( psz_extra, psz_text );
                             free( psz_text );
                         }
+                    }
 
                     for( i = 0; i < pE->i_entry_count; i++ )
                     {