code: drawterm

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fix some compiler warnings

--- a/kern/devaudio.c

+++ b/kern/devaudio.c

@@ -237,10 +237,8 @@

 	long m;

 	int i, v, left, right, in, out;

 	Cmdbuf *cb;

-	char *a;

 	USED(off);

-	a = vp;

 	switch((ulong)c->qid.path) {

 	default:

 		error(Eperm);

@@ -264,6 +262,7 @@

 			 */

 			if(cb->f[i][0] >= '0' && cb->f[i][0] <= '9') {

 				m = strtoul(cb->f[i], 0, 10);

+				USED(in);

 				if(!out)

 					goto cont0;

 				if(left && right)

--- a/kern/devip-win32.c

+++ b/kern/devip-win32.c

@@ -1,3 +1,4 @@

+#include <winsock2.h>

 #include <windows.h>

 #include <ws2tcpip.h>

 #include "u.h"

--- a/libmemdraw/draw.c

+++ b/libmemdraw/draw.c

@@ -94,7 +94,6 @@

 void

 memimagedraw(Memimage *dst, Rectangle r, Memimage *src, Point p0, Memimage *mask, Point p1, int op)

 {

-	static int n = 0;

 	Memdrawparam par;

 	if(mask == nil)