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fs: respond with zero read from readdir if buffer is too small

This matches the behavior of other filesystems and fixes large
directory listing for v9fs.

--- a/fs.c

+++ b/fs.c

@@ -1529,8 +1529,10 @@

 	p = r->data;

 	n = m->count;

 	if(s->overflow){

-		if((ns = kv2statbuf(&s->kv, p, n)) == -1)

-			return Edscan;

+		if((ns = kv2statbuf(&s->kv, p, n)) == -1){

+			r->count = 0;

+			return nil;

+		}

 		s->overflow = 0;

 		p += ns;

 		n -= ns;