t5615: fix a here-doc syntax error

This came as part of jk/quote-env-path-list-component and was merged
to 2.11.1 and later.

Noticed-by: Jan Palus <jan.palus@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5615-alternate-env.sh

@@ -77,6 +77,7 @@ test_expect_success 'mix of quoted and unquoted alternates' '
 	check_obj "$quoted:$unquoted" <<-EOF
 	$one blob
 	$two blob
+	EOF
 '
 
 test_expect_success !MINGW 'broken quoting falls back to interpreting raw' '