send-email: use "return;" not "return undef;" on error codepaths

diff --git a/git-send-email.perl b/git-send-email.perl
index be809e5b59394a4fd2f4f2b73cad6bac47a39600..79cc5bee9757c790f2a369d011ba2540f3c49332 100755 (executable)
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -711,7 +711,7 @@ sub ask {
                        }
                }
        }
-       return undef;
+       return;
 }
 
 my %broken_encoding;
@@ -833,7 +833,7 @@ sub extract_valid_address {
        # less robust/correct than the monster regexp in Email::Valid,
        # but still does a 99% job, and one less dependency
        return $1 if $address =~ /($local_part_regexp\@$domain_regexp)/;
-       return undef;
+       return;
 }
 
 sub extract_valid_address_or_die {
@@ -1484,7 +1484,7 @@ sub validate_patch {
                        return "$.: patch contains a line longer than 998 characters";
                }
        }
-       return undef;
+       return;
 }
 
 sub file_has_nonascii {