'usbpn_probe' is referenced only in this file. Make it static.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Acked-by: NRémi Denis-Courmont <remi@remlab.net>
Cc: Rémi Denis-Courmont <remi@remlab.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>