sfc: cleanup and reduce netlink error messages

Reduce the length of netlink error messages as they are likely to be
truncated anyway. Additionally, reword netlink error messages so they
are more consistent with previous messages.

Fixes: 9dbc8d2b ("sfc: add decrement ipv6 hop limit by offloading set hop limit actions")
Fixes: 3c9561c0 ("sfc: support TC decap rules matching on enc_ip_tos")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310202136.4u7bv0hp-lkp@intel.com/


Signed-off-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
Link: https://lore.kernel.org/r/20231020140149.30490-1-pieter.jansen-van-vuuren@amd.com


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