More JTAG interface driver cleanup:

- Make interface_jtag_execute_queue call new helper function.
- Add default_interface_jtag_execute_queue to wrap jtag interface access.

This patch may look useless on its own, but it helps to isolate the core
JTAG variables from the interface_jtag_* routines, so the later can be
moved into jtag_driver.c in a pending patch.


git-svn-id: svn://svn.berlios.de/openocd/trunk@1993 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/jtag/jtag.h

@@ -869,6 +869,13 @@ extern int interface_jtag_add_sleep(u32 us);
 extern int interface_jtag_add_clocks(int num_cycles);
 extern int interface_jtag_execute_queue(void);
 
+/**
+ * Calls the interface callback to execute the queue.  This routine
+ * is used by the JTAG driver layer and should not be called directly.
+ */
+extern int default_interface_jtag_execute_queue(void);
+
+
 #endif // INCLUDE_JTAG_MINIDRIVER_H
 
 /* this allows JTAG devices to implement the entire jtag_xxx() layer in hw/sw */