nfsd: fix boolreturn.cocci warnings

fs/nfsd/nfs4state.c:926:8-9: WARNING: return of 0/1 in function 'nfs4_delegation_exists' with return type bool
fs/nfsd/nfs4state.c:2955:9-10: WARNING: return of 0/1 in function 'nfsd4_compound_in_session' with return type bool

 Return statements in functions returning bool should use
 true/false instead of 1/0.
Generated by: scripts/coccinelle/misc/boolreturn.cocci

Fixes: 68b18f52947b ("nfsd: make nfs4_get_existing_delegation less confusing")
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
[bfields: also fix -EAGAIN]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

@@ -935,10 +935,10 @@ nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
 	list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
 		searchclp = searchdp->dl_stid.sc_client;
 		if (clp == searchclp) {
-			return -EAGAIN;
+			return true;
 		}
 	}
-	return 0;
+	return false;
 }
 
 /**
@@ -2958,7 +2958,7 @@ out_no_session:
 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
 {
 	if (!session)
-		return 0;
+		return false;
 	return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
 }