drm: Flatten drm_mode_vrefresh()

Remove the pointless whole-function indentation. Also don't
need to worry about negative values anymore since we switched
everything to u16.
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200428171940.19552-10-ville.syrjala@linux.intel.com

drivers/gpu/drm/drm_modes.c

@@ -757,11 +757,11 @@ EXPORT_SYMBOL(drm_mode_set_name);
  */
 int drm_mode_vrefresh(const struct drm_display_mode *mode)
 {
-	int refresh = 0;
-
-	if (mode->htotal > 0 && mode->vtotal > 0) {
 	unsigned int num, den;
 
+	if (mode->htotal == 0 || mode->vtotal == 0)
+		return 0;
+
 	num = mode->clock * 1000;
 	den = mode->htotal * mode->vtotal;
 
@@ -772,9 +772,7 @@ int drm_mode_vrefresh(const struct drm_display_mode *mode)
 	if (mode->vscan > 1)
 		den *= mode->vscan;
 
-		refresh = DIV_ROUND_CLOSEST(num, den);
-	}
-	return refresh;
+	return DIV_ROUND_CLOSEST(num, den);
 }
 EXPORT_SYMBOL(drm_mode_vrefresh);