[EXPAND] Free IFS state in evalbackcmd

On Sun, Nov 07, 2010 at 04:04:20PM -0600, Jonathan Nieder wrote:
> 
> Herbert Xu wrote:
> 
> > commit f42e443bb511ed3224f09b4fcf0772438ebdbbfa
> > Author: Herbert Xu <herbert@gondor.apana.org.au>
> > Date:   Wed Sep 8 20:07:26 2010 +0800
> > 
> >     [EXPAND] Fix ifsfirst/ifslastp leak
> 
> Another puzzle bisecting to f42e443bb.  This one comes from the
> grub-mkconfig script:
> 
>  $ sh -c 'datadir=/usr/share; pkgdatadir=${datadir}/`cat`' 2>&1 | cat -A
>  cat: M-^\^M^F^HM-4^M^F^HM-(^M^F^H: No such file or directory$
>  cat: M-(^M^F^H: No such file or directory$
> 
> Still reproducible with 016b529.  I'll try to find time to look into
> it, but thought you might like to know nevertheless.

This is the symptom of another leak.  In this case evalbackcmd
occurs in the middle of an expansion (as it should) but the forked
child never clears the previous IFS state.

This patch adds the missing ifsfree call.

This wasn't as much of a problem as the previously discovered leaks
since all it means is that the child gets to carry around the parent's
expansion state and the child is usually short-lived.

Reported-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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