Merge branch 'net-remove-unused-function-parameters-in-skbuff-c'

Michal Luczaj says:

====================
net: Remove unused function parameters in skbuff.c

Couple of cleanup patches to get rid of unused function parameters around
skbuff.c, plus little things spotted along the way.

Offshoot of my question in [1], but way more contained. Found by adding
"-Wunused-parameter -Wno-error" to KBUILD_CFLAGS and grepping for specific
skbuff.c warnings.

[1]: https://lore.kernel.org/netdev/972af569-0c90-4585-9e1f-f2266dab6ec6@rbox.co/

v2: https://lore.kernel.org/20250626-splice-drop-unused-v2-0-3268fac1af89@rbox.co
v1: https://lore.kernel.org/20250624-splice-drop-unused-v1-0-cf641a676d04@rbox.co
====================

Link: https://patch.msgid.link/20250702-splice-drop-unused-v3-0-55f68b60d2b7@rbox.co
Signed-off-by: Jakub Kicinski <kuba@kernel.org>