iommu/vt-d: Switch to bitmap_zalloc()
Switch to bitmap_zalloc() to show clearly what we are allocating. Besides that it returns pointer of bitmap type instead of opaque void *. Signed-off-by:Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
Joerg Roedel <jroedel@suse.de>
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