rpci: Use pci_dev struct pointer to avoid API breaks

The pci_dev structure is never meant to be used as is, but always as a
pointer. By using the struct itself in undo_pci_write_data, we are risking
data corruption, or buffer overflows if the structure size changes.

This is especially apparent on my system where flashrom segfaults
because I compile it with pciutils 3.3.0 and I run it on a system
with pciutils 3.5.2. The struture size is different and causes a
struct with the wrong size to be sent to the library, with invalid
internal field values.

This has been discovered and discussed in Change ID 18925 [1]

[1] https://review.coreboot.org/#/c/18925/

Change-Id: Icde2e587992ba964d4ff92c33aa659850ba06298
Signed-off-by: Youness Alaoui <kakaroto@kakaroto.homelinux.net>
---
M pcidev.c
M programmer.h
2 files changed, 16 insertions(+), 9 deletions(-)