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tweak: add missing return to fix double close(…) on file descriptor…
… and avoid printing conflicting messages.

--- a/sys/src/cmd/tweak.c

+++ b/sys/src/cmd/tweak.c

@@ -1731,6 +1731,7 @@

 		if(writeimage(fd, t->b, 0)<0 || (t->s && writesubfont(fd, t->s)<0)){

 			close(fd);

 			mesg("can't write %s: %r", t->name);

+			return;

 		}

 	t->mod = 0;

 	close(fd);

-- 

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