remove usless name matching in ethershutdown

Reference: /n/atom/patch/applied2013/ethervec2
Date: Sun Dec 29 16:26:28 CET 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/devether.c	Sun Dec 29 16:26:09 2013
+++ /sys/src/nix/k10/devether.c	Sun Dec 29 16:26:10 2013
@@ -464,7 +464,6 @@
 static void
 ethershutdown(void)
 {
-	char name[32];
 	int i;
 	Ether *ether;
 
@@ -476,7 +475,6 @@
 			print("#l%d: no shutdown function\n", i);
 			continue;
 		}
-		snprint(name, sizeof(name), "ether%d", i);
 		if(ether->vector != nil)
 			intrdisable(ether->vector);
 		(*ether->shutdown)(ether);