x86 gart: remove unnecessary set_bit_string

iommu_area_alloc internally calls set_bit_string and set bits
properly. This set_bit_string is unnecessary.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: joerg.roedel@amd.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
1 file changed