x86: Fix typo preventing msr_set/clear_bit from having an effect

x86: Fix typo preventing msr_set/clear_bit from having an effect

Due to a typo the msr accessor function introduced in
8f3f25e3688d4ca5334290b9623923289e516607 didn't have any lasting
effects because they accidentally wrote the old value back.

After 36ae3184129da29c69622def5e22921e01e11f08 this at the very least
this causes cpuid limits not to be lifted on some cpus leading to
missing capabilities for those.

Signed-off-by: Andres Freund <andres@anarazel.de>
Link: http://lkml.kernel.org/r/1399598957-7011-2-git-send-email-andres@anarazel.de
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>