[PATCH] PCI: clean up the MSI code a bit.

Mostly just cleans up the irq handling logic to be smaller and a bit more
descriptive as to what it really does.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --cc drivers/pci/msi.c
Simple merge

diff --cc drivers/pci/msi.h
Simple merge