[PATCH] selftests/watchdog-test: Fix system accidentally reset after watchdog-test

[Li Zhijian]

When running watchdog-test with 'make run_tests', the watchdog-test will
be terminated by a timeout signal(SIGTERM) due to the test timemout.

And then, a system reboot would happen due to watchdog not stop. see
the dmesg as below:
```
[ 1367.185172] watchdog: watchdog0: watchdog did not stop!
```

Fix it by registering more signals(including SIGTERM) in watchdog-test,
where its signal handler will stop the watchdog.

After that
 # timeout 1 ./watchdog-test
 Watchdog Ticking Away!
 .
 Stopping watchdog ticks...

Signed-off-by: Li Zhijian <lizhij...@fujitsu.com>
---
 tools/testing/selftests/watchdog/watchdog-test.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/watchdog/watchdog-test.c 
b/tools/testing/selftests/watchdog/watchdog-test.c
index bc71cbca0dde..a1f506ba5578 100644
--- a/tools/testing/selftests/watchdog/watchdog-test.c
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -334,7 +334,13 @@ int main(int argc, char *argv[])
 
        printf("Watchdog Ticking Away!\n");
 
+       /*
+        * Register the signals
+        */
        signal(SIGINT, term);
+       signal(SIGTERM, term);
+       signal(SIGKILL, term);
+       signal(SIGQUIT, term);
 
        while (1) {
                keep_alive();
-- 
2.44.0