array: clear unused array slots after remove

src/route.c

@@ -896,6 +896,7 @@ ni_route_array_remove(ni_route_array_t *nra, unsigned int index)
 	memmove(&nra->data[index], &nra->data[index + 1],
 		(nra->count - index) * sizeof(ni_route_t *));
 	nra->count--;
+	nra->data[nra->count] = NULL;
 
 	/* Don't bother with shrinking the array. It's not worth the trouble */
 	return rp;

src/socket.c

@@ -533,6 +533,7 @@ ni_socket_array_remove_at(ni_socket_array_t *array, unsigned int index)
 	memmove(&array->data[index], &array->data[index + 1],
 		(array->count - index) * sizeof(ni_socket_t *));
 	array->count--;
+	array->data[array->count] = NULL;
 
 	if (sock && sock->active == array)
 		sock->active = NULL;

src/update.c

@@ -161,6 +161,7 @@ ni_updater_source_array_remove(ni_updater_source_array_t *usa, unsigned int inde
 	memmove(&usa->data[index], &usa->data[index + 1],
 		(usa->count - index) * sizeof(ni_updater_source_t *));
 	usa->count--;
+	usa->data[usa->count] = NULL;
 
 	/* Don't bother with shrinking the array. It's not worth the trouble */
 	return ptr;

src/util.c

@@ -198,6 +198,7 @@ ni_string_array_remove_index(ni_string_array_t *nsa, unsigned int pos)
 	/* Note: this also copies the NULL pointer following the last element */
 	memmove(&nsa->data[pos], &nsa->data[pos + 1], (nsa->count - pos) * sizeof(char *));
 	nsa->count--;
+	nsa->data[nsa->count] = NULL;
 
 	/* Don't bother with shrinking the array. It's not worth the trouble */
 	return 0;