drm: rcar-du: Remove an unneeded NULL check

"params" can't be NULL here.  The next lines assume that we either
hit the break statement of "params->mpixelclock == ~0UL".  The
inconsistent NULL checking makes static checkers complain.  I've just
removed the test.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c

@@ -45,7 +45,7 @@ static int rcar_hdmi_phy_configure(struct dw_hdmi *hdmi,
 {
 	const struct rcar_hdmi_phy_params *params = rcar_hdmi_phy_params;
 
-	for (; params && params->mpixelclock != ~0UL; ++params) {
+	for (; params->mpixelclock != ~0UL; ++params) {
 		if (mpixelclock <= params->mpixelclock)
 			break;
 	}