Partially fix USBprog and JLink adapters on XScale target

Thanks to Peter Denison <openwrt(at)marshadder.org> 

git-svn-id: svn://svn.berlios.de/openocd/trunk@1471 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/jtag/jlink.c

@@ -433,7 +433,10 @@ void jlink_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size, sca
 	/* Move to appropriate scan state */
 	jlink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 
-	jlink_state_move();
+	/* Only move if we're not already there */
+	if (tap_get_state() != tap_get_end_state())
+		jlink_state_move();
+
 	jlink_end_state(saved_end_state);
 
 	/* Scan */