knotes: kqueue: handle copy for trivial filters

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D52045

sys/cam/scsi/scsi_pass.c

@@ -206,7 +206,8 @@ static struct cdevsw pass_cdevsw = {
 static const struct filterops passread_filtops = {
 	.f_isfd	=	1,
 	.f_detach =	passreadfiltdetach,
-	.f_event =	passreadfilt
+	.f_event =	passreadfilt,
+	.f_copy =	knote_triv_copy,
 };
 
 static MALLOC_DEFINE(M_SCSIPASS, "scsi_pass", "scsi passthrough buffers");

sys/cam/scsi/scsi_target.c

@@ -108,6 +108,7 @@ static const struct filterops targread_filtops = {
 	.f_isfd = 1,
 	.f_detach = targreadfiltdetach,
 	.f_event = targreadfilt,
+	.f_copy = knote_triv_copy,
 };
 
 static struct cdevsw targ_cdevsw = {