Ignore flush(OPTIONALLY) by default.

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1003 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

jtag/src/tap/cable/ft2232.c

@@ -680,6 +680,8 @@ ft2232_flush( cable_t *cable, cable_flush_amount_t how_much )
 {
 	params_t *params = (params_t *)cable->params;
 
+    if( how_much == OPTIONALLY ) return;
+
 	while (cable->todo.num_items > 0)
 	{
 		int i, j, n;

jtag/src/tap/cable/generic.c

@@ -227,6 +227,8 @@ do_one_queued_action( cable_t *cable )
 void
 generic_flush_one_by_one( cable_t *cable, cable_flush_amount_t how_much )
 {
+    if( how_much == OPTIONALLY ) return;
+
 	while( do_one_queued_action( cable ) );
 }
 
@@ -236,6 +238,8 @@ generic_flush_using_transfer( cable_t *cable, cable_flush_amount_t how_much )
 	int i, j, n;
 	char *in, *out;
 
+    if( how_much == OPTIONALLY ) return;
+
 	if(cable->todo.num_items == 0) return;
 
 	do

jtag/src/tap/cable/usbblaster.c

@@ -189,6 +189,8 @@ usbblaster_transfer( cable_t *cable, int len, char *in, char *out )
 static void
 usbblaster_flush( cable_t *cable, cable_flush_amount_t how_much )
 {
+    if( how_much == OPTIONALLY ) return;
+
 	while (cable->todo.num_items > 0)
 	{
 		int i, j, n, to_send = 0;