[patch] Error on setenv(..., NULL, ...)

[Paul Eggert]

Paul Pluzhnikov wrote:
> So it looks to me like the 2ecccaede9097f867284d352a881d8f226ba4fb7 is
> quite broken, and should be reverted.

I reverted it.  Sorry about that; it had a horrible typo (!= vs ==).  Does the 
attached (untested) patch work for you instead?  It fixes the typo, and also 
pacifies GCC so that GCC does not issue the bogus warning.

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