drm: omapdrm: dss: replace ternary operator with max()

Fix the following coccicheck warning:

drivers/gpu/drm/omapdrm/dss/dispc.c:2454:21-22: WARNING opportunity for max()

Signed-off-by: Guo Zhengkui <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/omapdrm/dss/dispc.c

···
 
 	*decim_x = DIV_ROUND_UP(width, in_width_max);
 
-	*decim_x = *decim_x > decim_x_min ? *decim_x : decim_x_min;
+	*decim_x = max(*decim_x, decim_x_min);
 	if (*decim_x > *x_predecim)
 		return -EINVAL;