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ether7688: fix compiler warnings

--- a/sys/src/9/mt7688/ether7688.c

+++ b/sys/src/9/mt7688/ether7688.c

@@ -191,7 +191,7 @@

 static int

-miird(Mii *mii, int pa, int ra)

+miird(Mii*, int pa, int ra)

 {

 	int val = 0;

 	int	timeout;

@@ -220,7 +220,7 @@

 static int

-miiwr(Mii *mii, int pa, int ra, int val)

+miiwr(Mii*, int pa, int ra, int val)

 {

 	int timeout;

@@ -542,10 +542,7 @@

  * 	is handled by the switch start up

  */

-	MiiPhy *phy;

-	Ether	*edev = ctlr->edev;

-	int		i, buf;

-	

+	Ether	*edev = ctlr->edev;	

 	if((ctlr->mii = malloc(sizeof(Mii))) == nil)

 		return -1;

@@ -554,7 +551,7 @@

 	ctlr->mii->mir	= miird;

 	ctlr->mii->miw	= miiwr;

-	if(mii(ctlr->mii, ~0) == 0 || (phy = ctlr->mii->curphy) == nil){

+	if(mii(ctlr->mii, ~0) == 0 || ctlr->mii->curphy == nil){

 		iprint("#l%d: init mii failure\n", edev->ctlrno);

 		free(ctlr->mii);

 		ctlr->mii = nil;

@@ -747,7 +744,6 @@

 	char* p;

 	Ctlr* ctlr;

 	int l;

-	Desc	*t, *r;

 	ctlr = edev->ctlr;