netfilter: IDLETIMER: fix invalid deference of timer

"timer" was checked for null, but used later without being re-checked.

Change-Id: Ib4d08cd49860c9f157d1cac556705ba85cd44f4e
Reported-by: dan.carpenter@oracle.com
Signed-off-by: JP Abgrall <jpa@google.com>
jf: kernel: merge I9505GUEUDNL3

Change-Id: Ic707296afd9992a00635f7ca6b845d25dce92fa2

Conflicts:
	arch/arm/mach-msm/Kconfig
	build-all.py
	drivers/bluetooth/bluesleep.c
	drivers/tty/serial/msm_serial_hs.c
	include/linux/diagchar.h
	kernel/cgroup.c
	kernel/power/wakelock.c