[PATCH 2/2] git: drop needless checks for old git

[Eric Wong <e@80x24.org>]

`ambiguous' was added in git 2.21, and `dangling' was the only
other possible phrase which was inadvertantly slipped in prior
to 2.21.  Thus there's no need to check for `notdir' or `loop'
responses since we aren't using `git cat-file --follow-symlinks'
anywhere.
---
 lib/PublicInbox/Git.pm | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index 63458ec6..1c77b4ce 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -330,11 +330,9 @@ sub check_async_step ($$) {
 	chomp(my $line = my_readline($self->{in_c}, $rbuf));
 	my ($hex, $type, $size) = split(/ /, $line);
 
-	# Future versions of git.git may have type=ambiguous, but for now,
-	# we must handle 'dangling' below (and maybe some other oddball
-	# stuff):
+	# git <2.21 would show `dangling' (2.21+ shows `ambiguous')
 	# https://public-inbox.org/git/20190118033845.s2vlrb3wd3m2jfzu@dcvr/T/
-	if ($hex eq 'dangling' || $hex eq 'notdir' || $hex eq 'loop') {
+	if ($hex eq 'dangling') {
 		my $ret = my_read($self->{in_c}, $rbuf, $type + 1);
 		$self->fail(defined($ret) ? 'read EOF' : "read: $!") if !$ret;
 	}
@@ -409,12 +407,9 @@ sub check {
 	check_async_wait($self);
 	my ($hex, $type, $size) = @$result;
 
-	# Future versions of git.git may show 'ambiguous', but for now,
-	# we must handle 'dangling' below (and maybe some other oddball
-	# stuff):
+	# git <2.21 would show `dangling' (2.21+ shows `ambiguous')
 	# https://public-inbox.org/git/20190118033845.s2vlrb3wd3m2jfzu@dcvr/T/
-	return if $type eq 'missing' || $type eq 'ambiguous';
-	return if $hex eq 'dangling' || $hex eq 'notdir' || $hex eq 'loop';
+	return if $type =~ /\A(?:missing|ambiguous)\z/ || $hex eq 'dangling';
 	($hex, $type, $size);
 }