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/lyb.h b/src/lyb.h
index 5e14a03..4fd75d5 100644
--- a/src/lyb.h
+++ b/src/lyb.h
@@ -35,7 +35,7 @@
         size_t position;
         uint8_t inner_chunks;
     } *subtrees;
-    LY_ARRAY_SIZE_TYPE subtree_size;
+    LY_ARRAY_COUNT_TYPE subtree_size;
 
     size_t byte_count;  /**< printed/parsed bytes */
     const struct ly_ctx *ctx;
@@ -87,7 +87,7 @@
  */
 
 /* just a shortcut */
-#define LYB_LAST_SUBTREE(lybctx) lybctx->subtrees[LY_ARRAY_SIZE(lybctx->subtrees) - 1]
+#define LYB_LAST_SUBTREE(lybctx) lybctx->subtrees[LY_ARRAY_COUNT(lybctx->subtrees) - 1]
 
 /* struct lyd_lyb_subtree allocation step */
 #define LYB_SUBTREE_STEP 4