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

[Paul Eggert]

Roland McGrath wrote:
> I'm a bit surprised the compiler actually figures out
> that VALLEN cannot be used uninitialized and doesn't emit the warning.
> But great if so.

Yes, GCC got smarter about that sort of thing quite some time ago -- I don't 
remember exactly when.  If this causes a problem with older GCCs I suppose 
someone will let us know.  In the meantime I installed the patch.