send-email: ask_default should apply to all emails, not just the first

Commit 6e18251 made the "Send this email?" prompt assume yes if confirm
= "inform" when it was unable to get a valid response. However, the
"yes" assumption only worked correctly for the first email. This commit
fixes the issue and confirms the fix by modifying the existing test for
the prompt to send multiple emails.

Reported by Matthieu Moy <Matthieu.Moy@imag.fr>

Signed-off-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -687,7 +687,7 @@ sub expand_aliases {
 
 # Variables we set as part of the loop over files
 our ($message_id, %mail, $subject, $reply_to, $references, $message,
-	$needs_confirm, $message_num);
+	$needs_confirm, $message_num, $ask_default);
 
 sub extract_valid_address {
 	my $address = shift;
@@ -845,7 +845,6 @@ sub send_message
 
 	if ($needs_confirm && !$dry_run) {
 		print "\n$header\n";
-		my $ask_default;
 		if ($needs_confirm eq "inform") {
 			$confirm_unconfigured = 0; # squelch this message for the rest of this run
 			$ask_default = "y"; # assume yes on EOF since user hasn't explicitly asked for confirmation

t/t9001-send-email.sh

@@ -462,12 +462,14 @@ test_expect_success 'confirm by default (due to --compose)' '
 test_expect_success 'confirm detects EOF (inform assumes y)' '
 	CONFIRM=$(git config --get sendemail.confirm) &&
 	git config --unset sendemail.confirm &&
+	rm -fr outdir &&
+	git format-patch -2 -o outdir &&
 	GIT_SEND_EMAIL_NOTTY=1 \
 		git send-email \
 			--from="Example <nobody@example.com>" \
 			--to=nobody@example.com \
 			--smtp-server="$(pwd)/fake.sendmail" \
-			$patches < /dev/null
+			outdir/*.patch < /dev/null
 	ret="$?"
 	git config sendemail.confirm ${CONFIRM:-never}
 	test $ret = "0"