sparc64: Fix memory leak in pci_register_iommu_region().

sparc64: Fix memory leak in pci_register_iommu_region().

[ Upstream commit e182c77cc291456eed127b1472952ddb59a81a9d ]

Found by kmemleak.

If request_resource() fails, we leak the struct resource we
allocated to represent the IOMMU mapping area.

This actually happens on sun4v machines because the IOMEM area is only
reported sans the IOMMU region, unlike all previous systems.  I'll
need to fix that at some point, but for now fix the leak.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>