Merge 2004-03-25-6.2.5-egidy-parserec.diff.

Merge 2004-03-25-6.2.5-egidy-parserec.diff.

Gerd v. Egidy writes:

a received header looking like this

Received: from code ([20.191.144.116])
          by

currently causes fetchmail 6.2.5 to segfault when in multidrop/received mode.

Looks like there is a check for \0 missing in parse_received, the
attached patch fixes this.
(Committer's note: the sample looks incomplete but anyways the patch
makes sense to me.)

svn path=/trunk/; revision=3941