tweaks to file buffering

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4575 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core.c

@@ -1070,6 +1070,8 @@ SWITCH_DECLARE(switch_status_t) switch_core_file_seek(switch_file_handle_t *fh,
 													int whence)
 {
 	assert(fh != NULL);
+
+	switch_set_flag(fh, SWITCH_FILE_SEEK);
 	return fh->file_interface->file_seek(fh, cur_pos, samples, whence);
 }