net: calxedaxgmac: Fix typo (doubled "the")

Fix a doubled word in the comment above xgmac_poll.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20220409182147.2509788-1-j.neuschaefer@gmx.net


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