net: bcmgenet: Do not return from void function

A stray return was added in the macro bcmgenet_##name##_writel where it
should not, drop it.

Reported-by: kbuild test robot <[e-mail]>
Fixes: 69d2ea9c7989 ("net: bcmgenet: Use correct I/O accessors")
Signed-off-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/broadcom/genet/bcmgenet.h

···
 					u32 val, u32 off)		\
 {									\
 	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) \
-		return __raw_writel(val, priv->base + offset + off);	\
+		__raw_writel(val, priv->base + offset + off);		\
 	else								\
 		writel_relaxed(val, priv->base + offset + off);		\
 }