ftdi: correct ftdi_initialize error text

Change-Id: If230c0b5b3a18fd273106b743404079d0cbc9ddc
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/880
Tested-by: jenkins

src/jtag/drivers/ftdi.c

@@ -638,7 +638,7 @@ static int ftdi_initialize(void)
 	if (retval == ERROR_OK)
 		retval = mpsse_set_data_bits_high_byte(mpsse_ctx, output >> 8, direction >> 8);
 	if (retval != ERROR_OK)	{
-		LOG_ERROR("couldn't initialize FTDI with 'JTAGkey' layout");
+		LOG_ERROR("couldn't initialize FTDI with configured layout");
 		return ERROR_JTAG_INIT_FAILED;
 	}