[U-Boot-Users] [PATCH] USB Storage, add meaningful return value

[Aras Vaichas <arasv@magtech.com.au>]

This patch changes the "usb storage" command to return success iff it
finds a USB storage device, otherwise it returns error.

This enables you to check for a USB storage device before trying to
access it:

if usb storage; then fatload usb 0 $loadaddr $filename; fi


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