npcm7xx_timer-test.c is unreliable

[Stefan Hajnoczi]

Hi,
Sometimes npcm7xx_timer-test fails intermittently: 
https://gitlab.com/qemu-project/qemu/-/jobs/5121787250

38/96 qemu:qtest+qtest-arm / qtest-arm/npcm7xx_timer-test           ERROR       
    0.95s   exit status 1
>>> QTEST_QEMU_BINARY=./qemu-system-arm 
>>> QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon 
>>> G_TEST_DBUS_DAEMON=/builds/qemu-project/qemu/tests/dbus-vmstate-daemon.sh 
>>> QTEST_QEMU_IMG=./qemu-img MALLOC_PERTURB_=103 
>>> /builds/qemu-project/qemu/build/tests/qtest/npcm7xx_timer-test --tap -k
――――――――――――――――――――――――――――――――――――― ✀  ―――――――――――――――――――――――――――――――――――――
stderr:
**
ERROR:../tests/qtest/npcm7xx_timer-test.c:475:test_periodic_interrupt: 
assertion failed (tim_read(td, TISR) == tim_timer_bit(td)): (0x00000000 == 
0x00000004)
**
ERROR:../tests/qtest/npcm7xx_timer-test.c:476:test_periodic_interrupt: 
'qtest_get_irq(global_qtest, tim_timer_irq(td))' should be TRUE
(test program exited with status code 1)
――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

When I reran the CI job, it passed.

Please investigate why this test is unreliable and fix it. Thanks!

There is a GitLab Issue to track this here:
https://gitlab.com/qemu-project/qemu/-/issues/1897

Stefan

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