sctp: Spelling s/preceeding/preceding/g

Fix a misspelling of "preceding".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/663b14d07d6d716ddc34482834d6b65a2f714cfb.1695903447.git.geert+renesas@glider.be


Signed-off-by: Jakub Kicinski <kuba@kernel.org>