kselftests: timers:Remove unneeded semicolon

Eliminate the following coccinelle check warning:
tools/testing/selftests/timers/alarmtimer-suspend.c:82:2-3

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Zhang Mingyu <zhang.mingyu@zte.com.cn>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>