various fixes (#49)

* libs: libc: math: Fix tanh() math functions
* drivers: mtd: smart: Fix trivial debug message in smartfs
* binfmt: libelf: Fix fd not closed on error
* binfmt: Fix stack memory leak on error
* fs: romfs: Fix private data not free on error
* sched: group: Fix reference after free memory
* sched: clock: Fix clock sync

Fix clock sync when CONFIG_RTC_HIRES is enabled

sched/clock/clock_initialize.c

@@ -175,9 +175,7 @@ static void clock_inittime(void)
   /* (Re-)initialize the time value to match the RTC */
 
 #ifndef CONFIG_CLOCK_TIMEKEEPING
-#ifndef CONFIG_RTC_HIRES
   clock_basetime(&g_basetime);
-#endif
 
 #ifndef CONFIG_SCHED_TICKLESS
   g_system_timer = INITIAL_SYSTEM_TIMER_TICKS;