posix: timers: correct pointer passed to k_mem_slab_free()

If it is not possible to create a timer in timer_create(),
then the timer_obj associated with the timer must be freed.

However, the address of the pointer was mistakenly being
passed to k_mem_slab_free() rather than simply the
the pointer.

This caused a crash in tests which can easily be avoided
by passing the pointer rather than the address of the
pointer.

Signed-off-by: Chris Friedt <[email protected]>

Author: Chris Friedt

lib/posix/options/timer.c

@@ -190,7 +190,7 @@ int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)
 	goto out;
 
 free_timer:
-	k_mem_slab_free(&posix_timer_slab, (void *)&timer);
+	k_mem_slab_free(&posix_timer_slab, (void *)timer);
 
 out:
 	return ret;