[POWERPC] Ensure we only handle PowerMac PCI bus fixup for memory resources

The fixup code that handles the case for PowerMac's that leave bridge
windows open over an inaccessible region should only be applied to
memory resources (IORESOURCE_MEM).  If not we can get it trying to fixup
IORESOURCE_IO on some systems since the other conditions that are used to
detect the case can easily match for IORESOURCE_IO.
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/kernel/pci-common.c

@@ -806,7 +806,8 @@ static void __devinit __pcibios_fixup_bus(struct pci_bus *bus)
 			 * equal to the pci_mem_offset of the host bridge and
 			 * their size is smaller than 1M.
 			 */
-			if (res->start == hose->pci_mem_offset &&
+			if (res->flags & IORESOURCE_MEM &&
+			    res->start == hose->pci_mem_offset &&
 			    res->end < 0x100000) {
 				printk(KERN_INFO
 				       "PCI: Closing bogus Apple Firmware"