[media] drx-j: propagate returned error from request_firmware()

Fix a smatch warning:
	drivers/media/dvb-frontends/drx39xyj/drxj.c:11711 drx_ctrl_u_code() info: why not propagate 'rc' from request_firmware() instead of (-2)?
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/dvb-frontends/drx39xyj/drxj.c

@@ -11708,7 +11708,7 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
 		rc = request_firmware(&fw, mc_file, demod->i2c->dev.parent);
 		if (rc < 0) {
 			pr_err("Couldn't read firmware %s\n", mc_file);
-			return -ENOENT;
+			return rc;
 		}
 		demod->firmware = fw;