drm/fb-helper: drop redundant pixclock check from drm_fb_helper_set_par()

The fb_check_var hook is supposed to validate all this stuff. Any
errors from fb_set_par are considered driver/hw issues and resulting
in dmesg warnings.

Luckily we do fix up the pixclock already, so this is all fine.

Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: danvet

drivers/gpu/drm/drm_fb_helper.c

@@ -1641,11 +1641,6 @@ int drm_fb_helper_set_par(struct fb_info *info)
 	if (oops_in_progress)
 		return -EBUSY;
 
-	if (var->pixclock != 0) {
-		drm_err(fb_helper->dev, "PIXEL CLOCK SET\n");
-		return -EINVAL;
-	}
-
 	/*
 	 * Normally we want to make sure that a kms master takes precedence over
 	 * fbdev, to avoid fbdev flickering and occasionally stealing the