[PATCH] Don't try to reclose in command_close_bidi_pipe

[Yuval Kogman <nothingmuch@woobling.org>]

Some commands require their standard input to be closed (like
git-commit-tree). This patch changes command_close_bidi_pipe so no
longer tries to close already closed handles, resulting in an error.
---
 perl/Git.pm |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/perl/Git.pm b/perl/Git.pm
index 7d7f2b1..283bba8 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -422,6 +422,7 @@ sub command_close_bidi_pipe {
 	local $?;
 	my ($pid, $in, $out, $ctx) = @_;
 	foreach my $fh ($in, $out) {
+		next unless defined(fileno($fh));
 		unless (close $fh) {
 			if ($!) {
 				carp "error closing pipe: $!";
-- 
1.6.1