PCI: Cleanup control flow

Return errors immediately so the straightline path is the normal,
no-error path.  No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --cc arch/arm/mach-dove/pcie.c
Simple merge

diff --cc arch/arm/mach-mv78xx0/pcie.c
Simple merge

diff --cc arch/arm/mach-orion5x/pci.c
Simple merge

diff --cc arch/mips/pci/pci.c
Simple merge

diff --cc arch/sh/drivers/pci/pci.c
Simple merge

diff --cc arch/sparc/kernel/leon_pci.c
Simple merge