IB/ipath: Correct ipath_verbs_register_sysfs() error handling

ipath_verbs_register_sysfs() never returned the correct error
code from device_create_file and never cleaned up from a failure.
Additionally, the caller of ipath_verbs_register_sysfs() doesn't
return the correct "ret" value.

This patch resolves all of these issues.

Reported-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/ipath/ipath_verbs.c

@@ -2187,7 +2187,8 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
 	if (ret)
 		goto err_reg;
 
-	if (ipath_verbs_register_sysfs(dev))
+	ret = ipath_verbs_register_sysfs(dev);
+	if (ret)
 		goto err_class;
 
 	enable_timer(dd);
@@ -2327,15 +2328,15 @@ static int ipath_verbs_register_sysfs(struct ib_device *dev)
 	int i;
 	int ret;
 
-	for (i = 0; i < ARRAY_SIZE(ipath_class_attributes); ++i)
-		if (device_create_file(&dev->dev,
-				       ipath_class_attributes[i])) {
-			ret = 1;
+	for (i = 0; i < ARRAY_SIZE(ipath_class_attributes); ++i) {
+		ret = device_create_file(&dev->dev,
+				       ipath_class_attributes[i]);
+		if (ret)
 			goto bail;
-		}
-
-	ret = 0;
-
+	}
+	return 0;
 bail:
+	for (i = 0; i < ARRAY_SIZE(ipath_class_attributes); ++i)
+		device_remove_file(&dev->dev, ipath_class_attributes[i]);
 	return ret;
 }