check_filename: tighten dwim-wildcard ambiguity

diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 256affce89517a707f9054d2c9643db4f5398832..c39e50028f256b6850327b90aa1137bd8e35ef1a 100755 (executable)
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -802,7 +802,7 @@ test_expect_success '--no-signature suppresses format.signaturefile ' '
 '
 
 test_expect_success '--signature-file overrides format.signaturefile' '
-       cat >other-mail-signature <<-\EOF
+       cat >other-mail-signature <<-\EOF &&
        Use this other signature instead of mail-signature.
        EOF
        test_config format.signaturefile mail-signature &&