[PATCH 2/2] difftool: handle uninitialized variable on empty diff

[Tim Henigan <tim.henigan@gmail.com>]

When 'difftool --dir-diff' finds no changes, it results in an
uninitialized variable warning.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
---
 git-difftool.perl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-difftool.perl b/git-difftool.perl
index 679a56d..c94557d 100755
--- a/git-difftool.perl
+++ b/git-difftool.perl
@@ -117,7 +117,7 @@ sub setup_dir_diff
 	# by Git->repository->command*.
 	my $diffrepo = Git->repository(Repository => $repo_path, WorkingCopy => $workdir);
 	my $diffrtn = $diffrepo->command_oneline('diff', '--raw', '--no-abbrev', '-z', @ARGV);
-	exit(0) if (length($diffrtn) == 0);
+	exit(0) if ((not defined($diffrtn)) or (length($diffrtn) == 0));
 
 	# Setup temp directories
 	my $tmpdir = tempdir('git-diffall.XXXXX', CLEANUP => 1, TMPDIR => 1);
-- 
1.7.11.1.134.gda62046