sout_MuxNew: constify.

include/vlc_sout.h

@@ -178,7 +178,7 @@ struct sout_input_t
 };
 
 
-VLC_EXPORT( sout_mux_t *,   sout_MuxNew,          ( sout_instance_t*, char *, sout_access_out_t * ) );
+VLC_EXPORT( sout_mux_t *,   sout_MuxNew,          ( sout_instance_t*, const char *, sout_access_out_t * ) );
 VLC_EXPORT( sout_input_t *, sout_MuxAddStream,    ( sout_mux_t *, es_format_t * ) );
 VLC_EXPORT( void,           sout_MuxDeleteStream, ( sout_mux_t *, sout_input_t * ) );
 VLC_EXPORT( void,           sout_MuxDelete,       ( sout_mux_t * ) );

src/stream_output/stream_output.c

@@ -404,7 +404,7 @@ int sout_AccessOutControl (sout_access_out_t *access, int query, ...)
 /*****************************************************************************
  * sout_MuxNew: create a new mux
  *****************************************************************************/
-sout_mux_t * sout_MuxNew( sout_instance_t *p_sout, char *psz_mux,
+sout_mux_t * sout_MuxNew( sout_instance_t *p_sout, const char *psz_mux,
                           sout_access_out_t *p_access )
 {
     static const char typename[] = "mux";