Staging: hv: mousevsc: Cleanup error handling

Cleanup error handling in this driver; use standard Linux error codes.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/hv_mouse.c

@@ -569,7 +569,7 @@ static int mousevsc_connect_to_vsp(struct hv_device *device)
 
 	if (!input_dev) {
 		pr_err("unable to get input device...device being destroyed?");
-		return -1;
+		return -ENODEV;
 	}
 
 
@@ -612,7 +612,7 @@ static int mousevsc_connect_to_vsp(struct hv_device *device)
 	if (!response->response.approved) {
 		pr_err("synthhid protocol request failed (version %d)",
 		       SYNTHHID_INPUT_VERSION);
-		ret = -1;
+		ret = -ENODEV;
 		goto cleanup;
 	}
 
@@ -629,7 +629,7 @@ static int mousevsc_connect_to_vsp(struct hv_device *device)
 	if (!input_dev->dev_info_status)
 		pr_info("**** input channel up and running!! ****");
 	else
-		ret = -1;
+		ret = -ENOMEM;
 
 cleanup:
 	put_input_device(device);
@@ -694,10 +694,8 @@ static int mousevsc_on_device_add(struct hv_device *device,
 
 	input_dev = alloc_input_device(device);
 
-	if (!input_dev) {
-		ret = -1;
-		goto cleanup;
-	}
+	if (!input_dev)
+		return -ENOMEM;
 
 	input_dev->init_complete = false;
 
@@ -714,7 +712,7 @@ static int mousevsc_on_device_add(struct hv_device *device,
 	if (ret != 0) {
 		pr_err("unable to open channel: %d", ret);
 		free_input_device(input_dev);
-		return -1;
+		return ret;
 	}
 
 	pr_info("InputVsc channel open: %d", ret);
@@ -743,7 +741,6 @@ static int mousevsc_on_device_add(struct hv_device *device,
 
 	input_dev->init_complete = true;
 
-cleanup:
 	return ret;
 }
 
@@ -789,16 +786,10 @@ static int mousevsc_on_device_remove(struct hv_device *device)
 static int mousevsc_probe(struct hv_device *dev,
 			const struct hv_vmbus_device_id *dev_id)
 {
-	int ret = 0;
-
 
 	/* Call to the vsc driver to add the device */
-	ret = mousevsc_on_device_add(dev, NULL);
+	return mousevsc_on_device_add(dev, NULL);
 
-	if (ret != 0)
-		return -1;
-
-	return 0;
 }
 
 static int mousevsc_remove(struct hv_device *dev)