tests: Don't inject newline in URL

It turns out libsoup strips all whitespace even *inside* a URL. We could do that
for libcurl too but...really, people shouldn't do that. In this test we were
adding the trailing newline into the URL. If someone complains who is using the
libcurl code we can deal with it then.

Closes: #651
Approved by: giuseppe

tests/test-pull-c.c

@@ -49,6 +49,8 @@ test_data_init (TestData *td)
   if (!g_file_get_contents ("httpd-address", &http_address, NULL, error))
     goto out;
 
+  g_strstrip (http_address);
+
   repo_url = g_strconcat (http_address, "/ostree/gnomerepo", NULL);
 
   { g_autoptr(GVariantBuilder) builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));