Fix annotate test script; notice when git-annotate fails.

The t8001-annotate.sh test claimed all tests pass, when in fact
the git-annotate perl script failed to run! (prior to fixing the
script to work with perl 5.5).
Signed-off-by: NRamsay Allan Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

t/annotate-tests.sh

@@ -4,7 +4,8 @@
 check_count () {
 	head=
 	case "$1" in -h) head="$2"; shift; shift ;; esac
-	$PROG file $head | perl -e '
+	$PROG file $head >.result || return 1
+	cat .result | perl -e '
 		my %expect = (@ARGV);
 		my %count = ();
 		while (<STDIN>) {