lockd: shift grabbing a reference to nlm_host into nlm_alloc_call()

It's used both for client and server hosts; we can't do nlmclnt_release_host()
on failure exits, since the host might need nlmsvc_release_host(), with BUG_ON()
for calling the wrong one.  Makes life simpler for callers, actually...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index 9a41fdc..185fda8 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -256,6 +256,7 @@
 		return rpc_system_err;
 
 	call = nlm_alloc_call(host);
+	nlmsvc_release_host(host);
 	if (call == NULL)
 		return rpc_system_err;