net: Properly define functions with no parameters

Defining a function with no parameters as 'T foo()' is the deprecated
K&R style, and is not strictly equivalent to defining it as 'T foo(void)'.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/cris/eth_v10.c b/drivers/net/cris/eth_v10.c
index 9c755db..f0c8bd5 100644
--- a/drivers/net/cris/eth_v10.c
+++ b/drivers/net/cris/eth_v10.c
@@ -1008,7 +1008,7 @@
 }
 
 static unsigned char
-e100_receive_mdio_bit()
+e100_receive_mdio_bit(void)
 {
 	unsigned char bit;
 	*R_NETWORK_MGM_CTRL = 0;