net: can: at91_can: remove unnecessary platform_set_drvdata()
The driver core clears the driver data to NULL after device_release or on probe failure, since commit 0998d063 (device-core: Ensure drvdata = NULL when no driver is bound). Thus, it is not needed to manually clear the device driver data to NULL. Signed-off-by: NJingoo Han <jg1.han@samsung.com> Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
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