input: do not allow negative input-repeat

Was going into infinite loop in that case.
refs #14389

src/input/input.c

@@ -609,7 +609,7 @@ static void MainLoopDemux( input_thread_t *p_input, bool *pb_changed, mtime_t i_
 static int MainLoopTryRepeat( input_thread_t *p_input, mtime_t *pi_start_mdate )
 {
     int i_repeat = var_GetInteger( p_input, "input-repeat" );
-    if( i_repeat == 0 )
+    if( i_repeat <= 0 )
         return VLC_EGENERIC;
 
     vlc_value_t val;

src/libvlc-module.c

@@ -1686,6 +1686,7 @@ vlc_module_begin ()
     set_section( N_( "Playback control" ) , NULL)
     add_integer( "input-repeat", 0,
                  INPUT_REPEAT_TEXT, INPUT_REPEAT_LONGTEXT, false )
+        change_integer_range( 0, 65535 )
         change_safe ()
     add_float( "start-time", 0,
                START_TIME_TEXT, START_TIME_LONGTEXT, true )