Staging: hv: netvsc: Cleanup error return codes in netvsc_device_add()

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/netvsc.c

@@ -918,7 +918,7 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
 
 	net_device = alloc_net_device(device);
 	if (!net_device) {
-		ret = -1;
+		ret = -ENOMEM;
 		goto cleanup;
 	}
 
@@ -947,7 +947,6 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
 
 	if (ret != 0) {
 		dev_err(&device->device, "unable to open channel: %d", ret);
-		ret = -1;
 		goto cleanup;
 	}
 
@@ -959,7 +958,6 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
 	if (ret != 0) {
 		dev_err(&device->device,
 			"unable to connect to NetVSP - %d", ret);
-		ret = -1;
 		goto close;
 	}