usbip: remove extra whitespace

Only one whitespace is enough after "return".

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/usbip/vhci_sysfs.c

@@ -192,7 +192,7 @@ static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
 	/* check sockfd */
 	socket = sockfd_to_socket(sockfd);
 	if (!socket)
-		return  -EINVAL;
+		return -EINVAL;
 
 	/* now need lock until setting vdev status as used */