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David Howells def304aae2 rxrpc: Fix rxkad crypto unalignment handling

Fix handling of a packet with a misaligned crypto length.  Also handle
non-ENOMEM errors from decryption by aborting.  Further, remove the
WARN_ON_ONCE() so that it can't be remotely triggered (a trace line can
still be emitted).

Fixes: f93af41b9f ("rxrpc: Fix missing error checks for rxkad encryption/decryption failure")
Closes: https://sashiko.dev/#/patchset/20260408121252.2249051-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Jeffrey Altman <jaltman@auristor.com>
cc: Simon Horman <horms@kernel.org>
cc: linux-afs@lists.infradead.org
cc: stable@kernel.org
Link: https://patch.msgid.link/20260422161438.2593376-3-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>