[U-Boot] fw_printenv: Don't bail out directly after one env read error

[Wolfgang Denk]

Dear Tom,

In message <20180628022059.GR4609 at bill-the-cat.ec.rr.com> you wrote:
> 
> > From: Joe Hershberger <joe.hershberger at ni.com>
> >=20
> > When using a redundant environment a read error should simply mean to
> > not use that copy instead of giving up completely. The other copy may
> > be just fine.
> >=20
> > Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>
> > Signed-off-by: Ioan-Adrian Ratiu <adrian.ratiu at ni.com>
>
> Applied to u-boot/master, thanks!

Please revert.  This is introducing a source for nasty, almost
impossible to detect bugs!

Read errors must never be ignored.

Best regards,

Wolfgang Denk

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