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fgui: check if fd is valid before entering new key

--- a/sys/src/cmd/auth/factotum/fgui.c

+++ b/sys/src/cmd/auth/factotum/fgui.c

@@ -792,10 +792,12 @@

 		entry[i].a->type = AttrNameval;

 	}

-	/* enter the new key !!!!need to do something in case of error!!!! */

+	/* enter the new key */

 	fd = open("/mnt/factotum/ctl", OWRITE);

-	fprint(fd, "key %A", r->a);

-	close(fd);

+	if(fd >= 0){

+		fprint(fd, "key %A", r->a);

+		close(fd);

+	}

 	teardownneedkey(r);

 out:

-- 

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