truncate both MYI and MYD files on DELETE FROM table; to avoid warnings on CHECK TABLE

myisam/mi_delete_all.c:
  truncate both MYI and MYD files to avoid warnings on CHECK TABLE

myisam/mi_delete_all.c

@@ -15,7 +15,7 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
 /* Remove all rows from a MyISAM table */
-/* This only clears the status information and truncates the data file */
+/* This clears the status information and truncates files */
 
 #include "myisamdef.h"
 
@@ -49,14 +49,15 @@ int mi_delete_all_rows(MI_INFO *info)
     state->key_root[i]= HA_OFFSET_ERROR;
 
   myisam_log_command(MI_LOG_DELETE_ALL,info,(byte*) 0,0,0);
-  VOID(_mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE));
-  if (my_chsize(info->dfile, 0, 0, MYF(MY_WME)))
-    goto err;
   /*
     If we are using delayed keys or if the user has done changes to the tables
     since it was locked then there may be key blocks in the key cache
   */
   flush_key_blocks(share->kfile, FLUSH_IGNORE_CHANGED);
+  if (my_chsize(info->dfile, 0, 0, MYF(MY_WME)) ||
+      my_chsize(share->kfile, share->base.keystart, 0, MYF(MY_WME))  )
+    goto err;
+  VOID(_mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE));
   allow_break();			/* Allow SIGHUP & SIGINT */
   DBUG_RETURN(0);