Merge branch 'net-fix-some-callers-of-copy_from_sockptr'

Michal Luczaj says:

====================
net: Fix some callers of copy_from_sockptr()

Some callers misinterpret copy_from_sockptr()'s return value. The function
follows copy_from_user(), i.e. returns 0 for success, or the number of
bytes not copied on error. Simply returning the result in a non-zero case
isn't usually what was intended.

Compile tested with CONFIG_LLC, CONFIG_AF_RXRPC, CONFIG_BT enabled.

Last patch probably belongs more to net-next, if any. Here as an RFC.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
====================

Link: https://patch.msgid.link/20241119-sockptr-copy-fixes-v3-0-d752cac4be8e@rbox.co
Signed-off-by: Paolo Abeni <pabeni@redhat.com>