arch_alarm: don't init local variable for fpu test case fail
D16 register will be cleared when compiling with gcc on some boards.
@@ -319,7 +319,7 @@ int weak_function up_alarm_tick_start(clock_t ticks)
if (g_oneshot_lower != NULL)
{
- clock_t now = 0;
+ clock_t now;
clock_t delta;
ONESHOT_TICK_CURRENT(g_oneshot_lower, &now);
