iommu/vt-d: Fix compile warning

Make intel_svm_unbind_mm() a static function.

Fixes: 064a57d ("iommu/vt-d: Replace intel SVM APIs with generic SVA APIs")
Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Jacob Pan <[email protected]>
Acked-by: Lu Baolu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: Jacob Pan

drivers/iommu/intel-svm.c

@@ -601,7 +601,7 @@ intel_svm_bind_mm(struct device *dev, int flags, struct svm_dev_ops *ops,
 }
 
 /* Caller must hold pasid_mutex */
-int intel_svm_unbind_mm(struct device *dev, int pasid)
+static int intel_svm_unbind_mm(struct device *dev, int pasid)
 {
 	struct intel_svm_dev *sdev;
 	struct intel_iommu *iommu;