gpu/drm: delete same check in if condition

In function drm_bridge_connector_get_modes_edid, drm_edid_is_valid
will check weather (!edid), no need to check again in the if
branch.
Signed-off-by: Bernard Zhao <bernard@vivo.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20201102030736.3833-1-bernard@vivo.com

drivers/gpu/drm/drm_bridge_connector.c

@@ -241,7 +241,7 @@ static int drm_bridge_connector_get_modes_edid(struct drm_connector *connector,
 		goto no_edid;
 
 	edid = bridge->funcs->get_edid(bridge, connector);
-	if (!edid || !drm_edid_is_valid(edid)) {
+	if (!drm_edid_is_valid(edid)) {
 		kfree(edid);
 		goto no_edid;
 	}