checkreqprot data member in selinux_state struct is accessed directly by
SELinux functions to get and set. This could cause unexpected read or
write access to this data member due to compiler optimizations and/or
compiler's reordering of access to this field.

Add helper functions to get and set checkreqprot data member in
selinux_state struct. These helper functions use READ_ONCE and
WRITE_ONCE macros to ensure atomic read or write of memory for
this data member.
Signed-off-by: NLakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: NStephen Smalley <stephen.smalley.work@gmail.com>
Suggested-by: NPaul Moore <paul@paul-moore.com>
Acked-by: NStephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: NPaul Moore <paul@paul-moore.com>