iommu/vt-d: Use bitmap_zalloc() when applicable
'iommu->domain_ids' is a bitmap. So use 'bitmap_zalloc()' to simplify code and improve the semantic. Also change the corresponding 'kfree()' into 'bitmap_free()' to keep consistency. Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/cb7a3e0a8d522447a06298a4f244c3df072f948b.1635018498.git.christophe.jaillet@wanadoo.frSigned-off-by: NLu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20211217083817.1745419-2-baolu.lu@linux.intel.comSigned-off-by: NJoerg Roedel <jroedel@suse.de>
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