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_data_helpers.c b/src/tree_data_helpers.c
index aa7fd63..599a5bc 100644
--- a/src/tree_data_helpers.c
+++ b/src/tree_data_helpers.c
@@ -249,7 +249,7 @@
 int
 lyb_has_schema_model(const struct lysc_node *sibling, const struct lys_module **models)
 {
-    LY_ARRAY_SIZE_TYPE u;
+    LY_ARRAY_COUNT_TYPE u;
 
     LY_ARRAY_FOR(models, u) {
         if (sibling->module == models[u]) {