neighbour: remove neigh_parms_destroy()

neigh_parms_destroy() is a simple kfree(), no need for
a forward declaration.

neigh_parms_put() can instead call kfree() directly.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250203151152.3163876-1-edumazet@google.com


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