iommu/dmar: Remove redundant ' != 0' when check return code
Usual pattern when we check for return code, which might be negative errno, is either (ret) or (!ret). Remove extra ' != 0' from condition. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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