keep_alive() fix for reset warnings.

git-svn-id: svn://svn.berlios.de/openocd/trunk@827 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/jtag/jtag.c

@@ -1071,6 +1071,7 @@ int MINIDRIVER(interface_jtag_add_sleep)(u32 us)
 
 void jtag_add_sleep(u32 us)
 {
+	keep_alive(); /* we might be running on a very slow JTAG clk */
 	int retval=interface_jtag_add_sleep(us);
 	if (retval!=ERROR_OK)
 		jtag_error=retval;