Check vendor_id for PCI based external programmers

Restructure PCI device detection code.
Rename pcidev_validate to pcidev_readbar.

Note: Slight changes in behaviour are possible, especially on dual/quad
chip NICs which appear as more than one PCI device. Found devices are no
longer printed at _pinfo level, but rather at _pdbg level.

Corresponding to flashrom svn r1548.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
diff --git a/programmer.h b/programmer.h
index d60fc5d..51d04fd 100644
--- a/programmer.h
+++ b/programmer.h
@@ -227,7 +227,7 @@
 	const char *vendor_name;
 	const char *device_name;
 };
-uintptr_t pcidev_validate(struct pci_dev *dev, int bar, const struct pcidev_status *devs);
+uintptr_t pcidev_readbar(struct pci_dev *dev, int bar);
 uintptr_t pcidev_init(int bar, const struct pcidev_status *devs);
 /* rpci_write_* are reversible writes. The original PCI config space register
  * contents will be restored on shutdown.