git: mount/umount: Small whitespace fix in the usage().

[YONETANI Tomokazu]

On Sat, Apr 16, 2011 at 01:54:14AM -0700, Sascha Wildner wrote:
> commit 8ff0ba6cb3c5b283162fc4242325625cd761ad39
> Author: Sascha Wildner <saw at online.de>
> Date:   Sat Apr 16 10:54:07 2011 +0200
> 
>     mount/umount: Small whitespace fix in the usage().

Thanks!