drivers/pci/controller/pcie-rockchip-host.c:628:1-3: WARNING: PTR_ERR_OR_ZERO can be used

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b371ddb94fae82b6565020639b7db31934043c65
commit: 069ade5dfec93dd2916a85df8b1bab2d578857bd Merge branch 'remotes/lorenzo/pci/rockchip'
date:   3 weeks ago

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>


coccinelle warnings: (new ones prefixed by >>)

>> drivers/pci/controller/pcie-rockchip-host.c:628:1-3: WARNING: PTR_ERR_OR_ZERO can be used

Please review and possibly fold the followup patch.

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