ia64: remove the unused pci_iommu_shutdown function

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/pci-dma.c

@@ -37,11 +37,6 @@ static int __init pci_iommu_init(void)
 /* Must execute after PCI subsystem */
 fs_initcall(pci_iommu_init);
 
-void pci_iommu_shutdown(void)
-{
-	return;
-}
-
 void __init
 iommu_dma_init(void)
 {