can: pcan_usb_core: remove obsolete variable open_time
The variable open_time in the struct peak_usb_device was used to protect
peak_usb_set_mode() only to be called, if the interface is up. Now the CAN
device infrastructure takes care of this.
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
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