test-should-fail: Fix distcheck

We were writing to the sourcedir.

Signed-off-by: Colin Walters <[email protected]>

tests/test-should-fail.sh

@@ -7,7 +7,7 @@ shift
 tmpd=$(mktemp -d -t lcfs-test.XXXXXX)
 trap 'rm -rf -- "$tmpd"' EXIT
 for f in $@; do
-    if $bindir/mkcomposefs --from-file $f $tmpd/out.cfs >/dev/null 2>err.txt; then
+    if $bindir/mkcomposefs --from-file $f $tmpd/out.cfs &>/dev/null; then
         fatal "Test case $f should have failed"
     fi
     echo "ok $f"