pci: mvebu: fix return value check in mvebu_pcie_probe()
pci: mvebu: fix return value check in mvebu_pcie_probe()

In case of error, function of_clk_get_by_name() returns
ERR_PTR() never returns NULL. The NULL test in the return
value check should be replaced with IS_ERR().

Signed-off-by: Wei Yongjun <b8f9cab8be13de37b9588aedad10a20fc3a68783@trendmicro.com.cn>
Acked-by: Thomas Petazzoni <a5d87d2bd7c424ee5cbdb4e978635bf653d5a005@free-electrons.com>
Signed-off-by: Jason Cooper <68c46a606457643eab92053c1c05574abb26f861@lakedaemon.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs