sky2.c driver uses netdev_warn() before the net device is initialized.
Fix it by using dev_warn() instead.
Signed-off-by: NKrzysztof Halasa <khalasa@piap.pl>

Link: https://lore.kernel.org/r/m3a6s1r1ul.fsf@t19.piap.plSigned-off-by: NJakub Kicinski <kuba@kernel.org>