[U-Boot] [PATCH] cmd/usb_mass_storage.c: Rework ums_init() ret logic slightly

[Tom Rini]

On Wed, Apr 20, 2016 at 11:01:56AM -0400, Tom Rini wrote:

> Previously, ret could be used uninitialized if
> blk_get_device_part_str() failed.  Default to ret being set to -1 so
> that we always return an err up if we have a problem and then invert the
> logic on testing ums_count as when that is non-zero is the time we can
> return 0.
> 
> Cc: John Tobias <john.tobias.ph at gmail.com>
> Acked-by: Marek Vasut <marex at denx.de>
> Signed-off-by: Tom Rini <trini at konsulko.com>

With the brace changes Marek suggested, applied to u-boot/master, thanks!

-- 
Tom
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