The value of return variable ret is 0 on some error paths, for example,
when pci_resource_start() returns a NULL pointer. 0 means no error in
this context, which is contrary to the fact. This patch fixes the bug.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=189011Signed-off-by: NPan Bian <bianpan2016@163.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>