disp: msm: sde: update smmu fault handler to print debug info

This change updates the smmu fault handlers in the display driver
to return -ENOSYS. This will print out useful debug information
from smmu driver.

Change-Id: I427982286abe4d592f270477c8ad2e2be74700c9
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>

msm/msm_smmu.c

@@ -426,11 +426,10 @@ static int msm_smmu_fault_handler(struct iommu_domain *domain,
 		int flags, void *token)
 {
 	struct msm_smmu_client *client;
-	int rc = -EINVAL;
 
 	if (!token) {
 		DRM_ERROR("Error: token is NULL\n");
-		return -EINVAL;
+		return -ENOSYS;
 	}
 
 	client = (struct msm_smmu_client *)token;
@@ -444,7 +443,7 @@ static int msm_smmu_fault_handler(struct iommu_domain *domain,
 	 * return -ENOSYS to allow smmu driver to dump out useful
 	 * debug info.
 	 */
-	return rc;
+	return -ENOSYS;
 }
 
 /**