run-tests: actually mark changed output as failure

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run-tests: actually mark changed output as failure

manifest hash: d657fbfb2f3bcf24038f20b17d776248e4b63b6b
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tests/run-tests

@@ -28,6 +28,7 b' for f in `ls test-* | grep -Ev "\\.|~"` ;'
 	echo $f output changed:
 	diff -u $H/$f.out .out && true
 	cp .out $H/$f.err
+	fail=1
     fi
 
     cd $H