[U-Boot] [U-Boot, v2, 3/4] travis.yml: fix 'set +e' in build script

[Tom Rini]

On Fri, Jan 26, 2018 at 04:31:06PM +0100, Daniel Schwierzeck wrote:

> The build script should not manipulate shell flags (especially '-e').
> A non-zero exit value can also be catched with 'cmd || ret=$?'.
> 
> Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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