NFSv4: Fix a credential leak in _nfs4_discover_trunking()

jira LE-1907
Rebuild_History Non-Buildable kernel-rt-5.14.0-284.30.1.rt14.315.el9_2
commit-author Trond Myklebust <trond.myklebust@hammerspace.com>
commit e83458f

Fixes: 4f40a5b ("NFSv4: Add an fattr allocation to _nfs4_discover_trunking()")
	Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
(cherry picked from commit e83458f)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

fs/nfs/nfs4proc.c

@@ -4012,7 +4012,7 @@ static int _nfs4_discover_trunking(struct nfs_server *server,
 
 	page = alloc_page(GFP_KERNEL);
 	if (!page)
-		return -ENOMEM;
+		goto out_put_cred;
 	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
 	if (!locations)
 		goto out_free;
@@ -4034,6 +4034,8 @@ static int _nfs4_discover_trunking(struct nfs_server *server,
 	kfree(locations);
 out_free:
 	__free_page(page);
+out_put_cred:
+	put_cred(cred);
 	return status;
 }