Add missing memset to 0 in AO, FSM and PAL

Author: adel-mamin

libs/ao/ao.c

@@ -234,6 +234,7 @@ void am_ao_unsubscribe_all(const struct am_ao *ao) {
 
 void am_ao_ctor(struct am_ao *ao, struct am_hsm_state state) {
     AM_ASSERT(ao);
+    memset(ao, 0, sizeof(*ao));
     am_hsm_ctor(&ao->hsm, state);
 }
 

libs/fsm/fsm.c

@@ -31,6 +31,7 @@
 
 #include <stdbool.h>
 #include <stddef.h>
+#include <string.h>
 
 #include "common/macros.h"
 #include "fsm/fsm.h"

libs/pal/posix/pal.c

@@ -39,6 +39,7 @@
 
 #include <stdio.h>
 #include <stdint.h>
+#include <string.h>
 
 #define _POSIX_C_SOURCE 200809L
 
@@ -378,6 +379,8 @@ void am_pal_flush(void) { fflush(stdout); }
 void am_pal_ctor(void) {
     struct am_pal_task *task = &task_main_;
 
+    memset(task, 0, sizeof(*task));
+
     task->thread = pthread_self();
     am_pal_mutex_init(&task->mutex);