bonding: don't force LACPDU tx to ~333 ms boundaries

The timer which ensures that no more than 3 LACPDUs are transmitted in
a second rearms itself every 333ms regardless of whether an LACPDU is
transmitted when the timer expires. This causes LACPDU tx to be delayed
until the next expiration of the timer, which effectively aligns LACPDUs
to ~333ms boundaries. This results in a variable amount of jitter in the
timing of periodic LACPDUs.

Change this to only rearm the timer when an LACPDU is actually sent,
allowing tx at any point after the timer has expired.

Signed-off-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>
Reviewed-by: Carlos Bilbao <carlos.bilbao@kernel.org>
Link: https://patch.msgid.link/20250625-fix-lacpdu-jitter-v1-1-4d0ee627e1ba@kernel.org


Signed-off-by: Paolo Abeni <pabeni@redhat.com>