update: Use const char * for psz_destdir.

include/vlc_update.h

@@ -57,7 +57,7 @@ VLC_EXPORT( update_t *, __update_New, ( vlc_object_t * ) );
 VLC_EXPORT( void, update_Delete, ( update_t * ) );
 VLC_EXPORT( void, update_Check, ( update_t *, void (*callback)( void*, bool ), void * ) );
 VLC_EXPORT( bool, update_NeedUpgrade, ( update_t * ) );
-VLC_EXPORT( void, update_Download, ( update_t *, char* ) );
+VLC_EXPORT( void, update_Download, ( update_t *, const char* ) );
 VLC_EXPORT( update_release_t*, update_GetRelease, ( update_t * ) );
 
 /**

src/misc/update.c

@@ -1447,7 +1447,7 @@ void update_DownloadReal( update_download_thread_t *p_udt );
  * \param dir to store the download file
  * \return nothing
  */
-void update_Download( update_t *p_update, char *psz_destdir )
+void update_Download( update_t *p_update, const char *psz_destdir )
 {
     assert( p_update );
 
@@ -1690,7 +1690,7 @@ bool update_NeedUpgrade( update_t *p_update )
     return false;
 }
 
-void update_Download( update_t *p_update, char *psz_destdir )
+void update_Download( update_t *p_update, const char *psz_destdir )
 {
     (void)p_update; (void)psz_destdir;
 }