orinoco: do not resgister NULL pm_notifier function
With DEBUG_NOTIFIERS it results in [11330.890966] WARNING: at /home/bor/src/linux-git/kernel/notifier.c:88 notifier_call_chain+0x91/0xa0() [11330.890977] Hardware name: PORTEGE 4000 [11330.890983] Invalid notifier called! ... Without DEBUG_NOTIFIERS it most likely crashes on NULL pointer. Signed-off-by: NAndrey Borzenkov <arvidjaar@mail.ru> Acked-by: NDavid Kilroy <kilroyd@googlemail.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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