histedit: Fix fs -s infinite loop

  $ id 1
  uid=1(daemon) gid=1(daemon) groups=1(daemon)
  $ fc -s 2
  fc -s 2
  fc -s 2
  fc -s 2
  fc -s 2
  src/dash: 1: fc: called recursively too many times
and I'm happy to call this "behaving exactly as I expected when I was
typing it in", so removing the XXX.

Adapted-from: NetBSD src bin/sh/histedit.c rev 1.38 by aymeric@
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
1 file changed