libqtest: Correct small memory leak.

Fixes a small memory leak inside of libqtest.
After we produce a test path and glib copies the string
for itself, we should clean up our temporary copy.

Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

tests/libqtest.c

@@ -644,6 +644,7 @@ void qtest_add_func(const char *str, void (*fn))
 {
     gchar *path = g_strdup_printf("/%s/%s", qtest_get_arch(), str);
     g_test_add_func(path, fn);
+    g_free(path);
 }
 
 void qtest_memwrite(QTestState *s, uint64_t addr, const void *data, size_t size)