locks.c: add the fl_owner to nlm_compare_locks

Add the fl_owner to NLM compare locks. Since two different client can
present the same pid to the server it is not enough to distinguish locks
from different clients. The fl_owner field is a pointer to the struct
nlm_host which is unique for each client.
Signed-off-by: NMarc Eshel <eshel@almaden.ibm.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

include/linux/lockd/lockd.h

@@ -220,6 +220,7 @@ static __inline__ int
 nlm_compare_locks(const struct file_lock *fl1, const struct file_lock *fl2)
 {
 	return	fl1->fl_pid   == fl2->fl_pid
+	     && fl1->fl_owner == fl2->fl_owner
 	     && fl1->fl_start == fl2->fl_start
 	     && fl1->fl_end   == fl2->fl_end
 	     &&(fl1->fl_type  == fl2->fl_type || fl2->fl_type == F_UNLCK);