drm/kms: fix spelling in error message

Signed-off-by: NPavel Roskin <proski@gnu.org>
[clemens@ladisch.de: merged into drm_fb_helper]
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/gpu/drm/drm_fb_helper.c

@@ -694,7 +694,7 @@ int drm_fb_helper_set_par(struct fb_info *info)
 	int i;
 
 	if (var->pixclock != 0) {
-		DRM_ERROR("PIXEL CLCOK SET\n");
+		DRM_ERROR("PIXEL CLOCK SET\n");
 		return -EINVAL;
 	}