iommu: sva: Fix compile error in iommu_sva_bind_group

hulk inclusion
category: bugfix
bugzilla: 51855
CVE: NA

---------------------------------------------

iommu_sva_bind_group should return pointer rather than an integer,
so it will cause compile error, if not defined CONFIG_IOMMU_API

Fixes: 45e52e3fc545 ("iommu: Add group variant for SVA bind/unbind")
Signed-off-by: NLijun Fang <fanglijun3@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/linux/iommu.h

@@ -1114,7 +1114,7 @@ static inline struct iommu_sva *
 iommu_sva_bind_group(struct iommu_group *group, struct mm_struct *mm,
 		     void *drvdata)
 {
-	return -ENODEV;
+	return NULL;
 }
 
 #endif /* CONFIG_IOMMU_API */