selftests:timers: globals don't need initialization to 0

Global variables do not need to be initialized to 0 and checkpatch
flags this error in tools/testing/selftests/timers/alarmtimer-suspend.c:

ERROR: do not initialise globals to 0
+int final_ret = 0;

Fix this checkpatch error.

Signed-off-by: Zan Aziz <zanaziz313@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>