t7006: modernize calls to unset

diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index 9a884751ec73ff721d658ebb69cbfe1f0270be85..7e433b179f9fcb0b3ccdd0ec83c6ec850735e391 100755 (executable)
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -119,7 +119,7 @@ test_expect_success 'fetch must not resolve short tag name' '
 test_expect_success 'fetch must not resolve short remote name' '
 
        cd "$D" &&
-       git update-ref refs/remotes/six/HEAD HEAD
+       git update-ref refs/remotes/six/HEAD HEAD &&
 
        mkdir six &&
        cd six &&