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samterm: free() after getenv()

--- a/sys/src/cmd/samterm/plan9.c

+++ b/sys/src/cmd/samterm/plan9.c

@@ -41,6 +41,7 @@

 	t = getenv("tabstop");

 	if(t != nil)

 		maxtab = strtoul(t, nil, 0);

+	free(t);

 	draw(screen, screen->clipr, display->white, nil, ZP);

 }