[PATCH] Char: moxa, use del_timer_sync

Use del_timer_sync in most timer deletions, we don't want to oops in the timer
function.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>