tests/functional/x86_64: Accept a few locked pages in test_memlock.py

Startup of libgcrypt locks a small pool of pages -- by default 16k.
Testing for zero locked pages is isn't correct, while testing for
32k is a decent compromise.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tests/functional/x86_64/test_memlock.py

@@ -37,7 +37,8 @@ class MemlockTest(QemuSystemTest):
 
         status = self.get_process_status_values(self.vm.get_pid())
 
-        self.assertTrue(status['VmLck'] == 0)
+        # libgcrypt may mlock a few pages
+        self.assertTrue(status['VmLck'] < 32)
 
     def test_memlock_on(self):
         self.common_vm_setup_with_memlock('on')