Merge branch 'jk/fix-remote-curl-url-wo-proto' into maint

"git fetch http::/site/path" did not die correctly and segfaulted
instead.

* jk/fix-remote-curl-url-wo-proto:
  remote-curl: handle URLs without protocol

t/t5550-http-fetch-dumb.sh

@@ -299,5 +299,13 @@ test_expect_success 'git client does not send an empty Accept-Language' '
 	! grep "^=> Send header: Accept-Language:" stderr
 '
 
+test_expect_success 'remote-http complains cleanly about malformed urls' '
+	# do not actually issue "list" or other commands, as we do not
+	# want to rely on what curl would actually do with such a broken
+	# URL. This is just about making sure we do not segfault during
+	# initialization.
+	test_must_fail git remote-http http::/example.com/repo.git
+'
+
 stop_httpd
 test_done