fix shellcheck error

Author: pzeballos

hooks/checkout

@@ -46,9 +46,9 @@ git clean -ffxdq
 # fetch branch if commit is HEAD, respecting BUILDKITE_GIT_FETCH_FLAGS if set
 FETCH_FLAGS="${BUILDKITE_GIT_FETCH_FLAGS:-}"
 if [[ ${BUILDKITE_COMMIT} = "HEAD" ]]; then
-    git fetch --depth 1 ${FETCH_FLAGS} origin "${BUILDKITE_BRANCH}"
+    git fetch --depth 1 "${FETCH_FLAGS}" origin "${BUILDKITE_BRANCH}"
 else
-    git fetch --depth 1 ${FETCH_FLAGS} origin "${BUILDKITE_COMMIT}"
+    git fetch --depth 1 "${FETCH_FLAGS}" origin "${BUILDKITE_COMMIT}"
 fi
 
 git sparse-checkout set ${NO_CONE_PARAM:+--no-cone} "${CHECKOUT_PATHS[@]}"

tests/checkout.bats

@@ -85,6 +85,8 @@ setup() {
   export BUILDKITE_GIT_FETCH_FLAGS="--prune --verbose"
   export BUILDKITE_COMMIT="HEAD"
   export BUILDKITE_BRANCH="main"
+
+  stub ssh-keyscan "* : echo 'keyscan'"
   stub git "clean * : echo 'git clean'"
   stub git "fetch --depth 1 --prune --verbose origin * : echo 'git fetch with flags'"
   stub git "sparse-checkout set * * : echo 'git sparse-checkout'"
@@ -95,5 +97,6 @@ setup() {
   assert_success
   assert_output --partial 'git fetch with flags'
 
+  unstub ssh-keyscan
   unstub git
 }