net: llc: fix repeated word 'all' in comment

Drop the second 'all', reported by checkpatch.pl as a possible repeated
word.  Only touches a comment, no code changes.

Signed-off-by: Hemanth Selam <hemanth.selam@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260908052602.27497-2-hemanth.selam@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>