iommu: Fix prototype of iommu_paging_domain_alloc_flags()

The iommu_paging_domain_alloc_flags() prototype for
non-iommu kernel configurations lacks the 'static inline'
prefixes.

Cc: Jason Gunthorpe <[email protected]>
Cc: Vasant Hegde <[email protected]>
Fixes: 20858d4 ("iommu: Introduce iommu_paging_domain_alloc_flags()")
Reviewed-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>

Author: joergroedel

include/linux/iommu.h

@@ -1080,7 +1080,7 @@ static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
 	return false;
 }
 
-struct iommu_domain *iommu_paging_domain_alloc_flags(struct device *dev,
+static inline struct iommu_domain *iommu_paging_domain_alloc_flags(struct device *dev,
 						     unsigned int flags)
 {
 	return ERR_PTR(-ENODEV);