[U-Boot] common: env_sf: Add exclamation mark

[Tom Rini]

On Mon, Mar 28, 2016 at 05:26:27PM +0800, Peng Fan wrote:

> Add exclamation mark to the errmsg, when error and set_default_env.
> 
> Signed-off-by: Peng Fan <van.freenix at gmail.com>
> Cc: Mario Schuknecht <mario.schuknecht at dresearch-fe.de>
> Cc: Vignesh R <vigneshr at ti.com>
> Cc: Jagan Teki <jteki at openedev.com>
> Cc: Ravi Babu <ravibabu at ti.com>
> Cc: York Sun <york.sun at nxp.com>
> Cc: Tom Rini <trini at konsulko.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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