[psaux] Remove unused structure field.

* include/freetype/internal/psaux.h (PS_TableRec): Remove `num_elems`.
* src/psaux/psobjs.c (ps_table_new): Remoove its initialization.
diff --git a/include/freetype/internal/psaux.h b/include/freetype/internal/psaux.h
index 48ec1df..df04ca0 100644
--- a/include/freetype/internal/psaux.h
+++ b/include/freetype/internal/psaux.h
@@ -132,9 +132,6 @@
    *   max_elems ::
    *     The maximum number of elements in table.
    *
-   *   num_elems ::
-   *     The current number of elements in table.
-   *
    *   elements ::
    *     A table of element addresses within the block.
    *
@@ -155,7 +152,6 @@
     FT_ULong           init;
 
     FT_Int             max_elems;
-    FT_Int             num_elems;
     FT_Byte**          elements;       /* addresses of table elements */
     FT_UInt*           lengths;        /* lengths of table elements   */
 
diff --git a/src/psaux/psobjs.c b/src/psaux/psobjs.c
index 371e538..703567f 100644
--- a/src/psaux/psobjs.c
+++ b/src/psaux/psobjs.c
@@ -84,7 +84,6 @@
 
     table->max_elems = count;
     table->init      = 0xDEADBEEFUL;
-    table->num_elems = 0;
     table->block     = NULL;
     table->capacity  = 0;
     table->cursor    = 0;