iommu: Remove extra NULL check when call strtobool()

strtobool() does check for NULL parameter already. No need to repeat.

While here, switch to kstrtobool() and unshadow actual error code
(which is still -EINVAL).

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index d2aa232..7f61b14 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -116,9 +116,11 @@ static void __iommu_detach_group(struct iommu_domain *domain,
 static int __init iommu_set_def_domain_type(char *str)
 {
        bool pt;
+       int ret;
 
-       if (!str || strtobool(str, &pt))
-               return -EINVAL;
+       ret = kstrtobool(str, &pt);
+       if (ret)
+               return ret;
 
        iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA;
        return 0;