[PATCH] env: env_sf: don't set .init op if not needed

[Wolfgang Denk <wd@denx.de>]

Dear Tom,

In message <20201106204557.GG5340@bill-the-cat> you wrote:
> 
> > Later (208bd2b8), _NOWHERE was made non-mutually-exclusive with the real
> > storage targets.
>
> Yes.  It's intentional that "NOWHERE" means that if this is our run-time
> location for the environment, then you cannot save the environment.  But
> since we finally implemented the ability to have more than one option
> enabled and pick the correct one at run time, we build both "mmc" and
> "nowhere".

But this breaks logic.  If you wanna have a nulldev, than implement
a /dev/null.

CONFIG_ENV_IS_NOWHERE should be the means to be used when no
environment storage drivers are needed / selected, not even
/dev/null.

Best regards,

Wolfgang Denk

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DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
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