t5516: correct misspelled pushInsteadOf

A future breakage to "git push" to make it incorrectly pay attention
to pushInsteadOf when it should not will be left uncaught without
this change.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5516-fetch-push.sh

@@ -237,7 +237,7 @@ test_expect_success 'push with pushInsteadOf' '
 test_expect_success 'push with pushInsteadOf and explicit pushurl (pushInsteadOf should not rewrite)' '
 	mk_empty testrepo &&
 	test_config "url.trash2/.pushInsteadOf" testrepo/ &&
-	test_config "url.trash3/.pusnInsteadOf" trash/wrong &&
+	test_config "url.trash3/.pushInsteadOf" trash/wrong &&
 	test_config remote.r.url trash/wrong &&
 	test_config remote.r.pushurl "testrepo/" &&
 	git push r refs/heads/master:refs/remotes/origin/master &&