libyang REFACTOR rename sized array size to count

... because it reflects the fact that it may not
always (internally) be the size of the array.
diff --git a/src/tree_schema_free.c b/src/tree_schema_free.c
index c931b4a..7416e6b 100644
--- a/src/tree_schema_free.c
+++ b/src/tree_schema_free.c
@@ -729,7 +729,7 @@
 static void
 lysc_node_leaflist_free(struct ly_ctx *ctx, struct lysc_node_leaflist *node)
 {
-    LY_ARRAY_SIZE_TYPE u;
+    LY_ARRAY_COUNT_TYPE u;
 
     FREE_ARRAY(ctx, node->musts, lysc_must_free);
     if (node->type) {
@@ -748,7 +748,7 @@
 static void
 lysc_node_list_free(struct ly_ctx *ctx, struct lysc_node_list *node)
 {
-    LY_ARRAY_SIZE_TYPE u;
+    LY_ARRAY_COUNT_TYPE u;
     struct lysc_node *child, *child_next;
 
     LY_LIST_FOR_SAFE(node->child, child_next, child) {