ia64: remove the unused bad_dma_address symbol

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

arch/ia64/kernel/pci-dma.c

@@ -15,9 +15,6 @@
 #include <linux/kernel.h>
 #include <asm/page.h>
 
-dma_addr_t bad_dma_address __read_mostly;
-EXPORT_SYMBOL(bad_dma_address);
-
 int no_iommu __read_mostly;
 #ifdef CONFIG_IOMMU_DEBUG
 int force_iommu __read_mostly = 1;