[U-Boot] cmd: nvedit: env_get_f must check for env_get_char error codes

[Tom Rini]

On Wed, Jan 31, 2018 at 07:56:48AM +0100, Simon Goldschmidt wrote:

> env_get_f calls env_get_char to load single characters from the
> environment. However, the return value of env_get_char was not
> checked for errors. Now if the env driver does not support the
> .get_char call, env_get_f did not notice this and looped over the
> whole size of the environment, calling env_get_char over 8000
> times with the default settings, just to return an error in the
> end.
> 
> Fix this by checking if env_get_char returns < 0.
> 
> Signed-off-by: Simon Goldschmidt <sgoldschmidt at de.pepperl-fuchs.com>
> Acked-by: Maxime Ripard <maxime.ripard at free-electrons.com>

Applied to u-boot/master, thanks!

-- 
Tom
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