Staging: hv: netvsc: return negative error codes

There was a typo here and we changed the -ENOMEM into +ENOMEM.  The
error codes aren't used, so this is just a cleanup.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/netvsc.c

@@ -125,7 +125,7 @@ static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
 		if (ret != 0) {
 			dev_err(&net_device->dev->device,
 				   "unable to teardown receive buffer's gpadl");
-			return -ret;
+			return ret;
 		}
 		net_device->recv_buf_gpadl_handle = 0;
 	}