cifs: avoid pointless cred reference count bump

During module init spnego_cred will be allocated with its own reference
which is only destroyed during module exit.

Link: https://lore.kernel.org/r/20241125-work-cred-v2-19-68b9d38bb5b2@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: brauner

fs/smb/client/cifs_spnego.c

@@ -173,9 +173,9 @@ cifs_get_spnego_key(struct cifs_ses *sesInfo,
 	}
 
 	cifs_dbg(FYI, "key description = %s\n", description);
-	saved_cred = override_creds(get_new_cred(spnego_cred));
+	saved_cred = override_creds(spnego_cred);
 	spnego_key = request_key(&cifs_spnego_key_type, description, "");
-	put_cred(revert_creds(saved_cred));
+	revert_creds(saved_cred);
 
 #ifdef CONFIG_CIFS_DEBUG2
 	if (cifsFYI && !IS_ERR(spnego_key)) {