USB: serial: keyspan: Fixed space around equals.

Changes to conform with checkpatch.sh script. - space around '='.
Removed 1 checkpatch.sh error.
Signed-off-by: Ben Minerds <puzzleduck@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/keyspan.c

@@ -474,7 +474,7 @@ static void usa28_indat_callback(struct urb *urb)
 		p_priv = usb_get_serial_port_data(port);
 		data = urb->transfer_buffer;
 
-		tty =tty_port_tty_get(&port->port);
+		tty = tty_port_tty_get(&port->port);
 		if (tty && urb->actual_length) {
 			tty_insert_flip_string(tty, data, urb->actual_length);
 			tty_flip_buffer_push(tty);