omapfb/dss: fix comparison to bool warning

Fix the following coccicheck warning:

drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c:461:15-32: WARNING:
Comparison to bool
drivers/video/fbdev/omap2/omapfb/dss/dispc.c:891:5-35: WARNING:
Comparison of 0/1 to bool variable

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Andrew F. Davis <afd@ti.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200422071903.637-1-yanaijie@huawei.com

drivers/video/fbdev/omap2/omapfb/dss/dispc.c

@@ -888,7 +888,7 @@ static void dispc_ovl_set_color_mode(enum omap_plane plane,
 static void dispc_ovl_configure_burst_type(enum omap_plane plane,
 		enum omap_dss_rotation_type rotation_type)
 {
-	if (dss_has_feature(FEAT_BURST_2D) == 0)
+	if (!dss_has_feature(FEAT_BURST_2D))
 		return;
 
 	if (rotation_type == OMAP_DSS_ROT_TILER)

drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c

@@ -455,11 +455,9 @@ static void hdmi_disconnect(struct omap_dss_device *dssdev,
 static int hdmi_read_edid(struct omap_dss_device *dssdev,
 		u8 *edid, int len)
 {
-	bool need_enable;
+	bool need_enable = !hdmi.core_enabled;
 	int r;
 
-	need_enable = hdmi.core_enabled == false;
-
 	if (need_enable) {
 		r = hdmi_core_enable(dssdev);
 		if (r)