MAINTAINERS+GitHub: Reflect ipfilter was moved from contrib to netpfil

Reflect the fact that ipfilter was moved from contrib to netpfil
on December 20, 2021 by 3b9b51fe46. And that ipfilter userland
was moved from contrib to sbin/ipf by 41edb306f0 that same day.

.github/CODEOWNERS

@@ -35,7 +35,7 @@
 /contrib/atf		@ngie-eign
 /contrib/capsicum-test	@ngie-eign
 /contrib/googletest	@ngie-eign
-/contrib/ipfilter	@cschuber
+/sbin/ipf		@cschuber
 /contrib/libcxxrt	@DimitryAndric @emaste
 /contrib/llvm-project	@DimitryAndric
 /contrib/llvm-project/libunwind @DimitryAndric @emaste @bsdjhb
@@ -69,7 +69,7 @@
 /sys/arm64/rockchip	@evadot
 /sys/compat/linprocfs/	@dag-erling
 /sys/compat/linuxkpi	@hselasky
-/sys/contrib/ipfilter	@cschuber
+/sys/netpfil/ipfilter	@cschuber
 /sys/crypto/openssl/	@juikim
 /sys/dev/drm2	@bsdimp
 /sys/dev/iscsi/	@trasz

MAINTAINERS

@@ -40,7 +40,7 @@ ath(4)		adrian	Pre-commit review requested, send to freebsd-wireless@freebsd.org
 contrib/atf		ngie,#test		Pre-commit review requested.
 contrib/capsicum-test	ngie,#capsicum,#test	Pre-commit review requested.
 contrib/googletest	ngie,#test		Pre-commit review requested.
-contrib/ipfilter	cy			Pre-commit review requested.
+sbin/ipf	cy			Pre-commit review requested.
 contrib/libcxxrt	dim,emaste		Pre-commit review preferred.
 contrib/llvm-project/compiler-rt	dim	Pre-commit review preferred.
 contrib/llvm-project/libcxx	dim		Pre-commit review preferred.
@@ -103,7 +103,7 @@ sys/compat/linuxkpi	hselasky		If in doubt, ask.
 						(to avoid drm graphics drivers
 						impact)
 sys/contrib/dev/ice	erj	Pre-commit phabricator review requested.
-sys/contrib/ipfilter	cy	Pre-commit review requested.
+sys/netpfil/ipfilter	cy	Pre-commit review requested.
 sys/dev/e1000	erj	Pre-commit phabricator review requested.
 sys/dev/ixgbe	erj	Pre-commit phabricator review requested.
 sys/dev/ixl	erj	Pre-commit phabricator review requested.