can: rcar_canfd: rcar_canfd_probe(): fix plain integer in transceivers[] init

Fix the following compile warning with C=1:

| drivers/net/can/rcar/rcar_canfd.c:1852:59: warning: Using plain integer as NULL pointer

Fixes: a0340df7eca4f28e ("can: rcar_canfd: Add transceiver support")
Reported-by: Jakub Kicinski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Steen Hegelund <[e-mail]>
Link: https://lore.kernel.org/all/7f7b0[e-mail]
Signed-off-by: Marc Kleine-Budde <[e-mail]>

drivers/net/can/rcar/rcar_canfd.c

···
 
 static int rcar_canfd_probe(struct platform_device *pdev)
 {
-	struct phy *transceivers[RCANFD_NUM_CHANNELS] = { 0, };
+	struct phy *transceivers[RCANFD_NUM_CHANNELS] = { NULL, };
 	const struct rcar_canfd_hw_info *info;
 	struct device *dev = &pdev->dev;
 	void __iomem *addr;