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gefs: fix use after free in putconn()

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

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

@@ -2291,7 +2291,7 @@

 {

 	Conn **pp;

 	Amsg *a;

-	Fid *f;

+	Fid *f, *nf;

 	int i;

 	if(adec(&c->ref) != 0)

@@ -2314,7 +2314,9 @@

 	for(i = 0; i < Nfidtab; i++){

 		lock(&c->fidtablk[i]);

-		for(f = c->fidtab[i]; f != nil; f = f->next){

+		for(f = c->fidtab[i]; f != nil; f = nf){

+			nf = f->next;

+			ainc(&f->ref);

 			lock(f);

 			a = nil;

 			clunkfid(c, f, &a);

-- 

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