Input: ff-memless - kill timer in destroy()

No timer must be left running when the device goes away.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reported-and-tested-by:  <syzbot+b6c55daa701fc389e286@syzkaller.appspotmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/1573726121.17351.3.camel@suse.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Change-Id: I0ab5a7740a2feb0fdc152fcbe717dcac34a99baf
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: fa3a5a1880c91bb92594ad42dfe9eedad7996b86
Signed-off-by: Alam Md Danish <amddan@codeaurora.org>