can: mcp251x: write intf only when needed
This patch introduces a variable "clear_intf" that hold the bits that should be cleared. Only read-modify-write register if "clear_intf" is set. Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de> Acked-by: NWolfgang Grandegger <wg@grandegger.com>
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