[U-Boot] env: fix potential stack overflow in environment functions

[Wolfgang Denk]

Dear Tom, dear Albert,

In message <20130405111710.8C04C200589 at gemini.denx.de> I wrote:
> 
> I hereby request to revert that commit.

In addition to commit 60d7d5a "env: fix potential stack overflow in
environment functions" discussed here, I think we should also revert
commit fcfa696 "ARM: increase lmb stack space reservation to 4KB"
because it is conceptually broken and just papers over the real
problems.

Best regards,

Wolfgang Denk

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