Avoid ``uninitialized value'' warning when there actually is no difference between...

diff --git a/IkiWiki/Plugin/editdiff.pm b/IkiWiki/Plugin/editdiff.pm
index 46eb1168edddd42b6086b646ae48d63cb7dd2111..2a70ca0b81a49c3113e6074bcb797d94e41e133e 100644 (file)
--- a/IkiWiki/Plugin/editdiff.pm
+++ b/IkiWiki/Plugin/editdiff.pm
@@ -25,7 +25,7 @@ sub diff ($$) { #{{{
 
        print DIFFIN $content;
        close DIFFIN;
-       my $ret;
+       my $ret='';
        while (<DIFFOUT>) {
                if (defined $ret) {
                        $ret.=$_;