send-email: do not pass bogus address to local sendmail binary

This makes t9001 test happy.  Also fixes the warning on
uninitialized $references variable again.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-send-email.perl

@@ -387,7 +387,9 @@ X-Mailer: git-send-email $gitversion
 		my $pid = open my $sm, '|-';
 		defined $pid or die $!;
 		if (!$pid) {
-			exec($smtp_server,'-i',@recipients) or die $!;
+			exec($smtp_server,'-i',
+			     map { scalar extract_valid_address($_) }
+			     @recipients) or die $!;
 		}
 		print $sm "$header\n$message";
 		close $sm or die $?;
@@ -420,7 +422,7 @@ X-Mailer: git-send-email $gitversion
 }
 
 $reply_to = $initial_reply_to;
-$references = $initial_reply_to;
+$references = $initial_reply_to || '';
 make_message_id();
 $subject = $initial_subject;
 

t/t9001-send-email.sh

@@ -13,10 +13,14 @@ test_expect_success \
 
 test_expect_success \
     'Setup helper tool' \
-    'echo "#!/bin/sh" > fake.sendmail
-     echo "shift" >> fake.sendmail
-     echo "echo \"\$*\" > commandline" >> fake.sendmail
-     echo "cat > msgtxt" >> fake.sendmail
+    '(echo "#!/bin/sh"
+      echo shift
+      echo for a
+      echo do
+      echo "  echo \"!\$a!\""
+      echo "done >commandline"
+      echo "cat > msgtxt"
+      ) >fake.sendmail
      chmod +x ./fake.sendmail
      git add fake.sendmail
      GIT_AUTHOR_NAME="A" git commit -a -m "Second."'
@@ -26,9 +30,12 @@ test_expect_success \
     'git format-patch -n HEAD^1
      git send-email -from="Example <nobody@example.com>" --to=nobody@example.com --smtp-server="$(pwd)/fake.sendmail" ./0001*txt'
 
+cat >expected <<\EOF
+!nobody@example.com!
+!author@example.com!
+EOF
 test_expect_success \
     'Verify commandline' \
-    'cline=$(cat commandline)
-     [ "$cline" == "nobody@example.com author@example.com" ]'
+    'diff commandline expected'
 
 test_done