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gefs: fix error handling in readsnap()

--- a/sys/src/cmd/gefs/fs.c

+++ b/sys/src/cmd/gefs/fs.c

@@ -2026,7 +2026,7 @@

 	}

 	if(s->donescan){

 		r->count = 0;

-		return;

+		goto Out;

 	}

 	p = r->data;

 	n = m->count;

@@ -2037,7 +2037,7 @@

 		d.qid.path = UNPACK64(s->kv.v + 1);

 		if((ns = dir2statbuf(&d, p, n)) == -1){

 			r->count = 0;

-			return;

+			goto Out;

 		}

 		s->overflow = 0;

 		p += ns;

@@ -2058,9 +2058,11 @@

 		n -= ns;

 	}

 	btexit(s);

+	r->count = p - r->data;

+

+Out:

 	poperror();

 	wunlock(f);

-	r->count = p - r->data;

 	return;

 }

-- 

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