Revert "cred: add missing return error code when set_cred_ucounts() failed"

This reverts commit 0855952ed4 which is
commit 5e6b8a50a7 upstream.

The "original" commit 905ae01c4a ("Add a reference to ucounts for each
cred"), should not have been applied to the 5.10.y tree, so revert it,
and the follow-on fixup patches as well.

Reported-by: "Eric W. Biederman" <ebiederm@xmission.com>
Link: https://lore.kernel.org/r/87v93k4bl6.fsf@disp2133
Cc: Yang Yingliang <yangyingliang@huawei.com>
Cc: Alexey Gladkov <legion@kernel.org>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/cred.c

@@ -372,8 +372,7 @@ int copy_creds(struct task_struct *p, unsigned long clone_flags)
 		ret = create_user_ns(new);
 		if (ret < 0)
 			goto error_put;
-		ret = set_cred_ucounts(new);
-		if (ret < 0)
+		if (set_cred_ucounts(new) < 0)
 			goto error_put;
 	}