Small patch for vfs_mount.c needs review

[Hans Petter Selasky]

Hi,

Here is a small patch for vfs_mount.c which irons out some problems with USB2 
and booting from a memory stick. This patch is just a workaround.

I think that an event driven model would be better where the OS is allowed to 
boot at the moment the root partition disk is plugged in.

Typically the USB memory stick will appear within 2 seconds of waiting. The 
patch has been tested with FreeSBIE.

I hope that the mailing list software did not strip away the attached patch.

--HPS
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