MIPS: locking/atomic: Fix atomic{_64,}_sub_if_positive

stable inclusion
from stable-v5.10.184
commit 1659268d1ab4c11923b8fde86eca91f4ce256c96
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8IRR2

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1659268d1ab4c11923b8fde86eca91f4ce256c96



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commit cb95ea79 upstream.

This looks like a typo and that caused atomic64 test failed.

Signed-off-by: Rui Wang <wangrui@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>