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acne/Mail: fix double-free (Bterm() in mesgshow())

--- a/sys/src/cmd/upas/Mail/comp.c

+++ b/sys/src/cmd/upas/Mail/comp.c

@@ -283,7 +283,6 @@

 					break;

 			Bterm(rfd);

 		}

-		Bterm(wfd);

 	}

 	Bterm(wfd);

 	fprint(c->addr, "$");