[U-Boot] [PATCH v3] cmd: env: print a message when setting UEFI variable failed

[Heinrich Schuchardt]

On 5/28/19 2:00 AM, AKASHI Takahiro wrote:
> Error message will alert a user that setting/deleting a variable failed.
>
> Signed-off-by: AKASHI Takahiro<takahiro.akashi at linaro.org>

Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> ---
> Changes in v3 (May 28, 2019)
> * change messages as Heinrich suggested
>
> Changes in v2 (May 24, 2019)
> * change a message to "Out of memory"
> * add more error messages
> ---