With a struct, correcting the code to prevent the warning.

Reference: /n/patches.lsub.org/patch/abacowarn
Date: Mon Jul  2 15:55:31 CES 2012
Signed-off-by: paurea@lsub.org

--- /sys/src/cmd/abaco/util.c	Thu Apr 12 12:25:21 2012
+++ /sys/src/cmd/abaco/util.c	Mon Jul  2 15:55:10 2012
@@ -687,22 +687,32 @@
 	error("can't exec");
 }
 
+typedef struct WprocArgs WprocArgs;
+
+struct WprocArgs {
+	Channel *sync;
+	int fd;
+	char *s;
+	long np;
+};
+
+
 static void
 writeproc(void *v)
 {
+	WprocArgs *w;
 	Channel *sync;
-	void **a;
 	char *s;
 	long np;
 	int fd, i, n;
 
 	threadsetname("writeproc");
-	a = v;
-	sync = a[0];
-	fd = (int)a[1];
-	s = a[2];
-	np =(long)a[3];
-	free(a);
+	w = v;
+	sync = w->sync;
+	fd = w->fd;
+	s = w->s;
+	np = w->np;
+	free(w);
 
 	for(i=0; i<np; i+=n){
 		n = np-i;
@@ -749,7 +759,7 @@
 	Exec *e;
 	Rune r;
 	long i, n;
-	void **a;
+	WprocArgs *w;
 	uchar *us;
 	char buf[BUFSIZE], cmd[50];
 	char *t, *u;
@@ -824,12 +834,12 @@
 	if(sync == nil)
 		error("can't create channel");
 
-	a = emalloc(4*sizeof(void *));
-	a[0] = sync;
-	a[1] = (void *)p[1];
-	a[2] = s;
-	a[3] = (void *)*np;
-	proccreate(writeproc, a, STACK);
+	w = emalloc(sizeof(WprocArgs));
+	w->sync = sync;
+	w->fd = p[1];
+	w->s = s;
+	w->np = *np;
+	proccreate(writeproc, w, STACK);
 
 	s = nil;
 	while((n = read(q[0], buf, sizeof(buf))) > 0){