pps: trivial fixes

Here are some very trivial fixes combined:

- add macro definitions to protect header file from including several times

- remove declaration for an unexistent array

- fix typos

Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Acked-by: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/pps/kapi.c

@@ -324,7 +324,7 @@ void pps_event(int source, struct pps_ktime *ts, int event, void *data)
 		captured = ~0;
 	}
 
-	/* Wake up iif captured somthing */
+	/* Wake up if captured something */
 	if (captured) {
 		pps->go = ~0;
 		wake_up_interruptible(&pps->queue);