net: dsa: microchip: fix Clang -Wunused-const-variable warning on 'ksz_dt_ids'

This patch removes the of_match_ptr() pointer when dereferencing the
ksz_dt_ids which produce the unused variable warning.
Reported-by: Nkernel test robot <lkp@intel.com>
Suggested-by: NArnd Bergmann <arnd@kernel.org>
Signed-off-by: NArun Ramadoss <arun.ramadoss@microchip.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/dsa/microchip/ksz_spi.c

@@ -215,7 +215,7 @@ static struct spi_driver ksz_spi_driver = {
 	.driver = {
 		.name	= "ksz-switch",
 		.owner	= THIS_MODULE,
-		.of_match_table = of_match_ptr(ksz_dt_ids),
+		.of_match_table = ksz_dt_ids,
 	},
 	.id_table = ksz_spi_ids,
 	.probe	= ksz_spi_probe,