UPSTREAM: wireguard: queueing: use CFI-safe ptr_ring cleanup function

We make too nuanced use of ptr_ring to entirely move to the skb_array
wrappers, but we at least should avoid the naughty function pointer cast
when cleaning up skbs. Otherwise RAP/CFI will honk at us. This patch
uses the __skb_array_destroy_skb wrapper for the cleanup, rather than
directly providing kfree_skb, which is what other drivers in the same
situation do too.

Bug: 254441685
Reported-by: PaX Team <pageexec@freemail.hu>
Fixes: 886fcee939ad ("wireguard: receive: use ring buffer for incoming handshakes")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit ec59f128a9bd4255798abb1e06ac3b442f46ef68)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I049ef81fa1ff7a062d95094f879cdc9917129581