Calculate the resulting_hash beforehand

ext/swiftlint/downloadSwiftlint.sh

@@ -33,18 +33,19 @@ done
 
 set -x
 
+### Download
+mkdir -p "${destination}"
+curl -s -L "${url}" -o "${asset}"
+
 # If macOS
 if [[ "$OSTYPE" == "darwin"* ]]; then
-   hash_cmd="md5 -q ${asset}"
+   resulting_hash=`md5 -q ${asset}`
 # Default to linux
 else
-   hash_cmd="md5sum ${asset} | awk '{ print $1 }'"
+   resulting_hash=`md5sum ${asset} | awk '{ print $1 }'`
 fi
 
-### Download
-mkdir -p "${destination}"
-curl -s -L "${url}" -o "${asset}"
-if [[ ! -z "${SWIFTLINT_VERSION}" || "$hash_cmd" == "${default_hash}" ]]; then
+if [[ ! -z "${SWIFTLINT_VERSION}" || "$resulting_hash" == "${default_hash}" ]]; then
   # if another version is set || our hardcoded hash is correct
   unzip -o -q "${asset}" -d "${destination}"
 else