edac: i5000: improve handling of pci_enable_device() return value

edac: i5000: improve handling of pci_enable_device() return value

-EIO is not the only error code that pci_enable_device() may return, also
the set of errors can be enhanced in future.  We should compare return
code with zero, not with concrete error value.

Signed-off-by: Kulikov Vasiliy <[email protected]>
Acked-by: Mauro Carvalho Chehab <[email protected]>
Cc: Jeff Roberson <[email protected]>
Cc: Doug Thompson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>