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kernel: fix rewinding in directories with pread() offset

reading directories with pread() offset has to work the same
way as read(), otherwise exportfs breaks rewinding in directories.

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

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

@@ -655,7 +655,7 @@

 		error(Enegoff);

 	if(off == 0){	/* rewind to the beginning of the directory */

-		if(offp == nil){

+		if(offp == nil || (c->qid.type & QTDIR)){

 			c->offset = 0;

 			c->devoffset = 0;

 		}

@@ -677,7 +677,7 @@

 	}else

 		nnn = nn = devtab[c->type]->read(c, p, n, off);

-	if((c->qid.type & QTDIR) || offp == nil){

+	if(offp == nil || (c->qid.type & QTDIR)){

 		lock(c);

 		c->devoffset += nn;

 		c->offset += nnn;