can: mcp251x: mcp251x_can_probe(): silence clang warning

This patch silences the following clang warning:

| drivers/net/can/spi/mcp251x.c:1333:17: warning: cast to smaller integer type
| 'enum mcp251x_model' from 'const void *' [-Wvoid-pointer-to-enum-cast]
|                 priv->model = (enum mcp251x_model)match;
|                               ^~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: 8de29a5c34 ("can: mcp251x: Make use of device property API")
Link: https://lore.kernel.org/r/20210504200520.1179635-2-mkl@pengutronix.de
Reported-by: kernel test robot <lkp@intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/spi/mcp251x.c

@@ -1330,7 +1330,7 @@ static int mcp251x_can_probe(struct spi_device *spi)
 	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 		CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY;
 	if (match)
-		priv->model = (enum mcp251x_model)match;
+		priv->model = (enum mcp251x_model)(uintptr_t)match;
 	else
 		priv->model = spi_get_device_id(spi)->driver_data;
 	priv->net = net;