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kernel: use nil for pointers instead of 0, zero channel umc and dirrock in newchan()

--- a/sys/src/9/port/chan.c

+++ b/sys/src/9/port/chan.c

@@ -250,16 +250,20 @@

 	c->offset = 0;

 	c->devoffset = 0;

 	c->iounit = 0;

-	c->umh = 0;

+	c->umh = nil;

+	c->umc = nil;

 	c->uri = 0;

 	c->dri = 0;

-	c->aux = 0;

-	c->mchan = 0;

-	c->mcp = 0;

-	c->mux = 0;

-	memset(&c->mqid, 0, sizeof(c->mqid));

-	c->path = 0;

+	c->dirrock = nil;

+	c->nrock = 0;

+	c->mrock = 0;

 	c->ismtpt = 0;

+	c->mcp = nil;

+	c->mux = nil;

+	c->aux = nil;

+	c->mchan = nil;

+	memset(&c->mqid, 0, sizeof(c->mqid));

+	c->path = nil;

 	return c;

 }

@@ -444,7 +448,7 @@

 	if(c->dirrock != nil){

 		free(c->dirrock);

-		c->dirrock = 0;

+		c->dirrock = nil;

 		c->nrock = 0;

 		c->mrock = 0;

 	}

@@ -868,8 +872,7 @@

 		error("clone failed");

 	nc = wq->clone;

 	free(wq);

-	nc->path = c->path;

-	if(c->path)

+	if((nc->path = c->path) != nil)

 		incref(c->path);

 	return nc;

 }

@@ -924,7 +927,7 @@

 	if(findmount(cp, mp, (*cp)->type, (*cp)->dev, (*cp)->qid) == 0)

 		return 0;

-	if(path){

+	if(path != nil){

 		p = *path;

 		p = uniquepath(p);

 		if(p->mlen <= 0)

--- a/sys/src/9/port/sysfile.c

+++ b/sys/src/9/port/sysfile.c

@@ -355,7 +355,7 @@

 		/* Advance to next element */

 		c->uri++;

-		if(c->umc){

+		if(c->umc != nil){

 			cclose(c->umc);

 			c->umc = nil;

 		}