auth: call GLib iteration loop if needed

Should fix a memory leak in Polkit.

Thanks to Alex Shargalin for the bug report and patch
"IsClientAuthorized() memory leak #87"
#87

Author: LudovicRousseau

src/auth.c

@@ -177,6 +177,9 @@ unsigned IsClientAuthorized(int socket, const char* action, const char* reader)
 cleanup1:
 	g_object_unref(authority);
 
+	while (g_main_context_pending(NULL))
+		g_main_context_iteration(NULL, TRUE);
+
 	return ret;
 }