NLM: Fix sparse warnings

- fs/lockd/xdr4.c:140:27: warning: incorrect type in argument 2 (different
explicit signedness)
- fs/lockd/xdr4.c:141:27: warning: incorrect type in argument 2 (different
explicit signedness)
- fs/lockd/xdr4.c:432:28: warning: incorrect type in argument 2 (different
explicit signedness)
- fs/lockd/xdr4.c:433:28: warning: incorrect type in argument 2 (different
explicit signedness)
- fs/lockd/xdr4.c:587:20: warning: symbol 'nlm_version4' was not declared.
Should it be static?

Signed-off-by: Trond Myklebust <[e-mail]>

fs/lockd/xdr.c

···
 		.procs		= nlm_procedures,
 };
 
-#ifdef 	CONFIG_LOCKD_V4
-extern struct rpc_version nlm_version4;
-#endif
-
 static struct rpc_version *	nlm_versions[] = {
 	[1] = &nlm_version1,
 	[3] = &nlm_version3,

fs/lockd/xdr4.c

···
 nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
 {
 	struct file_lock	*fl = &lock->fl;
-	__s64			len, start, end;
+	__u64			len, start;
+	__s64			end;
 
 	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 					    &lock->len, NLM_MAXSTRLEN))
···
 	if (resp->status == nlm_lck_denied) {
 		struct file_lock	*fl = &resp->lock.fl;
 		u32			excl;
-		s64			start, end, len;
+		__u64			start, len;
+		__s64			end;
 
 		memset(&resp->lock, 0, sizeof(resp->lock));
 		locks_init_lock(fl);

include/linux/lockd/xdr4.h

···
 int	nlmclt_encode_cancargs(struct rpc_rqst *, u32 *, struct nlm_args *);
 int	nlmclt_encode_unlockargs(struct rpc_rqst *, u32 *, struct nlm_args *);
  */
+extern struct rpc_version nlm_version4;
 
 #endif /* LOCKD_XDR4_H */