x86, AMD IOMMU: remove unnecessary set_bit_string

The set_bit_string call in the address allocator is not necessary because its
already called in iommu_area_alloc().

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: robert.richter@amd.com
Cc: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/amd_iommu.c

@@ -301,7 +301,6 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
 				0, boundary_size, 0);
 
 	if (likely(address != -1)) {
-		set_bit_string(dom->bitmap, address, pages);
 		dom->next_bit = address + pages;
 		address <<= PAGE_SHIFT;
 	} else