sk: clean up empty lines in .c and .h files

sys/dev/sk/if_sk.c

@@ -265,7 +265,7 @@ static int sysctl_hw_sk_int_mod(SYSCTL_HANDLER_ARGS);
 /* Tunables. */
 static int jumbo_disable = 0;
 TUNABLE_INT("hw.skc.jumbo_disable", &jumbo_disable);
- 
+
 /*
  * It seems that SK-NET GENESIS supports very simple checksum offload
  * capability for Tx and I believe it can generate 0 checksum value for
@@ -936,7 +936,6 @@ sk_discard_rxbuf(sc_if, idx)
 	struct sk_rxdesc	*rxd;
 	struct mbuf		*m;
 
-
 	r = &sc_if->sk_rdata.sk_rx_ring[idx];
 	rxd = &sc_if->sk_cdata.sk_rxdesc[idx];
 	m = rxd->rx_m;
@@ -2536,7 +2535,6 @@ sk_start_locked(ifp)
 	}
 }
 
-
 static void
 sk_watchdog(arg)
 	void			*arg;

sys/dev/sk/if_skreg.h

@@ -133,7 +133,6 @@
  * there are a few 16-bit and 8-bit ones as well.
  */
 
-
 /* Start of remappable register window. */
 #define SK_WIN_BASE		0x0080