app_voicemail: Don't delete mailbox state unless mailbox is deleted

The free_user function was automatically deleting the stasis mailbox
state but this only makes sense when the mailbox is actually
deleted, not just the structure freed.  This was causing issues
where leave_voicemail would publish the mwi message to stasis and
delete the state before the message could be processed by
res_pjsip_mwi.

* Removed the delete of state from free_user().

* Created a new free_user_final() function that both frees the data
  structure and deletes the state.  This function is only called
  during module load/unload where it's appropriate to delete the
  state.

ASTERISK-28215

Change-Id: I305e8b3c930e9ac41d901e5dc8a58fd7904d98dd

apps/app_voicemail.c

@@ -2043,10 +2043,6 @@ static void free_user(struct ast_vm_user *vmu)
 		return;
 	}
-	if (!ast_strlen_zero(vmu->mailbox)) {
-		ast_delete_mwi_state_full(vmu->mailbox, vmu->context, NULL);
-	}
-
 	ast_free(vmu->email);
 	vmu->email = NULL;
 	ast_free(vmu->emailbody);
@@ -2059,6 +2055,19 @@ static void free_user(struct ast_vm_user *vmu)
 	}
 }
+static void free_user_final(struct ast_vm_user *vmu)
+{
+	if (!vmu) {
+		return;
+	}
+
+	if (!ast_strlen_zero(vmu->mailbox)) {
+		ast_delete_mwi_state_full(vmu->mailbox, vmu->context, NULL);
+	}
+
+	free_user(vmu);
+}
+
 static int vm_allocate_dh(struct vm_state *vms, struct ast_vm_user *vmu, int count_msg) {
 	int arraysize = (vmu->maxmsg > count_msg ? vmu->maxmsg : count_msg);
@@ -13540,7 +13549,7 @@ static void free_vm_users(void)
 	AST_LIST_LOCK(&users);
 	while ((current = AST_LIST_REMOVE_HEAD(&users, list))) {
 		ast_set_flag(current, VM_ALLOCED);
-		free_user(current);
+		free_user_final(current);
 	}
 	AST_LIST_UNLOCK(&users);
 }