drm/edid: Use ARRAY_SIZE in drm_add_modes_noedid

Spotted while reading code for random reasons.

Reviewed-by: Thierry Reding <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/drm_edid.c

···
 	struct drm_display_mode *mode;
 	struct drm_device *dev = connector->dev;
 
-	count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
+	count = ARRAY_SIZE(drm_dmt_modes);
 	if (hdisplay < 0)
 		hdisplay = 0;
 	if (vdisplay < 0)