[U-Boot] [U-Boot,12/15] bootstage: Tidy up error return values

[Tom Rini]

On Mon, May 22, 2017 at 05:05:33AM -0600, Simon Glass wrote:

> We should return a proper error number instead of just -1. This helps the
> caller to determine what when wrong. Update a few functions to fix this.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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