net: dsa: remove check for dp->pl in EEE methods

net: dsa: remove check for dp->pl in EEE methods

When user ports are initialised, a phylink instance is always created,
and so dp->pl will always be non-NULL. The EEE methods are only used
for user ports, so checking for dp->pl to be NULL makes no sense. No
other phylink-calling method implements similar checks in DSA. Remove
this unnecessary check.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://patch.msgid.link/E1tL13z-006cZ7-BZ@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>