Fix a small bug introduced by "7a36987ff (send-email: add an auto option
for transfer encoding, 2018-07-14)"

I saw the following message when setting --transfer-encoding for a file
with the same encoding:
    $ git send-email --transfer-encoding=8bit example.patch
    Use of uninitialized value $xfer_encoding in concatenation (.) or string
    at /usr/lib/git-core/git-send-email line 1744.

v2 adds a test provided by brian m. carlson.

Signed-off-by: Aaron Lindsay <[email protected]>
Signed-off-by: brian m. carlson <[email protected]>
---
 git-send-email.perl   |  2 +-
 t/t9001-send-email.sh | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index 2be5dac33..39c15bcc8 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1834,7 +1834,7 @@ sub apply_transfer_encoding {
        my $from = shift;
        my $to = shift;
 
-       return $message if ($from eq $to and $from ne '7bit');
+       return ($message, $to) if ($from eq $to and $from ne '7bit');
 
        require MIME::QuotedPrint;
        require MIME::Base64;
diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index 1ef1a1900..ee1efcc59 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -492,6 +492,21 @@ do
                        --validate \
                        $patches longline.patch
        '
+
+done
+
+for enc in 7bit 8bit quoted-printable base64
+do
+       test_expect_success $PREREQ "--transfer-encoding=$enc produces correct 
header" '
+               clean_fake_sendmail &&
+               git send-email \
+                       --from="Example <[email protected]>" \
+                       [email protected] \
+                       --smtp-server="$(pwd)/fake.sendmail" \
+                       --transfer-encoding=$enc \
+                       $patches &&
+               grep "Content-Transfer-Encoding: $enc" msgtxt1
+       '
 done
 
 test_expect_success $PREREQ 'Invalid In-Reply-To' '
-- 
2.19.1

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