Staging: vme: Fix a white space issue

The below checkpatch error was fixed.

-ERROR: trailing whitespace
Signed-off-by: Toshiaki Yamane <yamanetoshi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vme/devices/vme_user.c

@@ -396,7 +396,7 @@ static ssize_t vme_user_write(struct file *file, const char __user *buf,
 	default:
 		retval = -EINVAL;
 	}
-	
+
 	mutex_unlock(&image[minor].mutex);
 
 	if (retval > 0)