t9142: stop httpd after the test

Otherwise it would fail in subsequent runs if the same
SVN_HTTPD_PORT was used.

Signed-off-by: Eric Wong <normalperson@yhbt.net>

t/t9142-git-svn-shallow-clone.sh

@@ -27,4 +27,6 @@ test_expect_success 'clone trunk with "-r HEAD"' '
 	( cd g && git rev-parse --symbolic --verify HEAD )
 '
 
+stop_httpd
+
 test_done