check_locking.c: Fix annoying invisible read_unlock
Apparently in certain kernel configs read_unlock is defined as
_raw_read_unlock that is further defined as __raw_read_unlock.
But read_lock is only defined as _raw_read_lock.
Teach check_locking.c about the __ versions of the raw_read_lock
functions
This fixes spurious errors like:
kernel/exec_domain.c:74 lookup_exec_domain() error: double lock 'read_lock:&exec_domains_lock'
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>