pkgs/woodpecker: add help function

packages/woodpecker/update.sh

@@ -3,14 +3,19 @@
 
 # shellcheck shell=bash
 
+function help () {
+    echo "Regenerates packaging data for the woodpecker packages."
+    echo "Usage: $0 <rev>"
+    exit 1
+}
+
 if [ -n "$GITHUB_TOKEN" ]; then
     TOKEN_ARGS=(--header "Authorization: token $GITHUB_TOKEN")
 fi
 
+
 if [[ $# -gt 1 || $1 == -* ]]; then
-    echo "Regenerates packaging data for the woodpecker packages."
-    echo "Usage: $0 <rev>"
-    exit 1
+  help
 fi
 
 set -x
@@ -21,7 +26,7 @@ version="$1"
 set -euo pipefail
 
 if [ -z "$version" ]; then
-  echo "Usage: $0 <rev>"
+  help
 fi
 
 # Woodpecker repository