tty.c: Handle EINVAL and use recommended inotify event size.

The TTY plugin might fail in read() with EINVAL if the inotify event
buffer is too small.  Fix: set the receive event buffer to the size
recommended in inotify(7).  Also add a handler for EINVAL to close and
reinitialize the inotify descriptor so we do not accidentally overrun
the CPU with any unhandled errors.

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

tty.h

@@ -25,9 +25,10 @@
 #ifndef FINIT_TTY_H_
 #define FINIT_TTY_H_
 
+#include <limits.h>
 #include "queue.h"		/* BSD sys/queue.h API */
 
-#define EVENT_SIZE ((sizeof(struct inotify_event) + 20))
+#define EVENT_SIZE ((sizeof(struct inotify_event) + NAME_MAX + 1))
 
 typedef struct {
 	char  *name;