pgsql: Hmm, so evidently _check_lock and _clear_lock take an argument of

Log Message:
-----------
Hmm, so evidently _check_lock and _clear_lock take an argument of type
int not unsigned int. Third try to get grebe building without warnings...

Modified Files:
--------------
pgsql/src/include/storage:
s_lock.h (r1.161 -> r1.162)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/s_lock.h.diff?r1=1.161&r2=1.162)