libpci: Fix intel_sanity_check() function

libpci: Fix intel_sanity_check() function

Function intel_sanity_check() calls conf1_read() which access d->domain
field. But intel_sanity_check() does not initialize this field and so
conf1_read() access some random data on stack.

Tests showed that intel_sanity_check() always fails as in d->domain is
stored some non-zero number.

Fix this issue by zeroing struct pci_dev d in intel_sanity_check() as
sanity check is verifying PCI devices at domain 0.