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cwfs: various cleanups

- consistently refer to Dentry.name length with NAMELEN
- make sure whoname is null terminated
- remove useless nil check for whoname

--- a/sys/src/cmd/cwfs/9p2.c

+++ b/sys/src/cmd/cwfs/9p2.c

@@ -348,7 +348,7 @@

 	r->qid = file->qid;

-	strncpy(chan->whoname, f->uname, sizeof(chan->whoname));

+	snprint(chan->whoname, sizeof(chan->whoname), "%s", f->uname);

 	chan->whotime = time(nil);

 out:

 	if(p != nil)

@@ -913,7 +913,7 @@

 		goto phase;

 	}

-	strncpy(d1->name, f->name, sizeof(d1->name));

+	strncpy(d1->name, f->name, NAMELEN);

 	if(chan == cons.chan){

 		d1->uid = cons.uid;

 		d1->gid = cons.gid;

@@ -1014,7 +1014,6 @@

 	}

 	iounit = chan->msize-IOHDRSZ;

 	if(count < 0 || count > iounit){

-fprint(2, "fs_read %d %d\n", count, iounit);

 		error = Ecount;

 		goto out;

 	}

@@ -1786,7 +1785,7 @@

 		}

 		d->size = dir.length;

 		if(dir.name != d->name)

-			strncpy(d->name, dir.name, sizeof(d->name));

+			strncpy(d->name, dir.name, NAMELEN);

 		d->uid = uid;

 		d->gid = gid;

 		d->muid = muid;

--- a/sys/src/cmd/cwfs/con.c

+++ b/sys/src/cmd/cwfs/con.c

@@ -14,7 +14,7 @@

 {

 	int i;

-	strncpy(cons.chan->whochan, "console", sizeof(cons.chan->whochan));

+	snprint(cons.chan->whochan, sizeof(cons.chan->whochan), "console");

 	installcmds();

 	con_session();

 	cmd_exec("cfs");

@@ -312,8 +312,7 @@

 				continue;

 			}

 		}

-		print("%3d: %10s %24s", cp->chan,

-			cp->whoname? cp->whoname: "<nowhoname>", cp->whochan);

+		print("%3d: %10s %24s", cp->chan, cp->whoname, cp->whochan);

 		if(cp->whoprint)

 			cp->whoprint(cp);

 		print("\n");

--- a/sys/src/cmd/cwfs/sub.c

+++ b/sys/src/cmd/cwfs/sub.c

@@ -46,7 +46,7 @@

 		chans = cp;

 		cp->chan = cons.chano;

 		cons.chano++;

-		strncpy(cp->whoname, "<none>", sizeof cp->whoname);

+		snprint(cp->whoname, sizeof(cp->whoname), "<none>");

 		wlock(&cp->reflock);

 		wunlock(&cp->reflock);

 		rlock(&cp->reflock);