[media] tuner-xc2028: fix "=" vs "==" typo

We intended to do a compare here, not an assignment.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/common/tuners/tuner-xc2028.c

@@ -756,7 +756,7 @@ static int check_firmware(struct dvb_frontend *fe, unsigned int type,
 	 * No need to reload base firmware if it matches and if the tuner
 	 * is not at sleep mode
 	 */
-	if ((priv->state = XC2028_ACTIVE) &&
+	if ((priv->state == XC2028_ACTIVE) &&
 	    (((BASE | new_fw.type) & BASE_TYPES) ==
 	    (priv->cur_fw.type & BASE_TYPES))) {
 		tuner_dbg("BASE firmware not changed.\n");