tty.c: Free memory for external getty on tty_unregister()

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/tty.h

@@ -28,6 +28,7 @@
 #include <limits.h>
 #include <lite/queue.h>		/* BSD sys/queue.h API */
 
+#define TTY_MAX_ARGS 16
 #define EVENT_SIZE ((sizeof(struct inotify_event) + NAME_MAX + 1))
 
 typedef struct {
@@ -38,7 +39,7 @@ typedef struct {
 	int    runlevels;
 
 	char  *cmd;		/* NULL when running built-in getty */
-	char  *args[10];
+	char  *args[TTY_MAX_ARGS];
 
 	int    pid;
 } finit_tty_t;