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cifs: fix rfork() race with shard pid variable

--- a/sys/src/cmd/cifs/main.c

+++ b/sys/src/cmd/cifs/main.c

@@ -1325,10 +1325,11 @@

 	if(Nshares == 0)

 		fprint(2, "no available shares\n");

-	if((Keeppid = rfork(RFPROC|RFMEM|RFNOTEG|RFFDG|RFNAMEG)) == 0){

+	if((i = rfork(RFPROC|RFMEM|RFNOTEG|RFFDG|RFNAMEG)) == 0){

 		keepalive();

 		exits(nil);

 	}

+	Keeppid = i;

 	postmountsrv(&fs, svs, mtpt, MREPL|MCREATE);

 	exits(nil);

 }