usb: ftdi-elan: remove variable err_count

Variable err_count is just being incremented and it's never used
anywhere else. The variable and the increment are redundant so
remove it.
Signed-off-by: NColin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20221020130649.1546112-1-colin.i.king@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/ftdi-elan.c

@@ -1956,7 +1956,6 @@ static int ftdi_elan_synchronize(struct usb_ftdi *ftdi)
 	int long_stop = 10;
 	int retry_on_timeout = 5;
 	int retry_on_empty = 10;
-	int err_count = 0;
 	retval = ftdi_elan_flush_input_fifo(ftdi);
 	if (retval)
 		return retval;
@@ -2051,7 +2050,6 @@ static int ftdi_elan_synchronize(struct usb_ftdi *ftdi)
 					continue;
 				}
 			} else {
-				err_count += 1;
 				dev_err(&ftdi->udev->dev, "error = %d\n",
 					retval);
 				if (read_stop-- > 0) {