fix on_return funcname

bin/miaou-bash

@@ -78,7 +78,7 @@ function on_return {
   if [[ "$BASH_COMMAND" =~ $regex ]] && [[ "${BASH_REMATCH[1]}" -gt 0 ]]; then
     failure_code="${BASH_REMATCH[1]}"
     failure_type="RETURN"
-    failure_payload="${FUNCNAME[0]}"
+    failure_payload="${FUNCNAME[1]}"
     print_miaou_error "${BASH_SOURCE[1]}" "${BASH_LINENO[0]}" "${failure_code}" "${failure_type}" "${failure_payload}"
     miaou_debug "<on_return code=$failure_code payload=$failure_payload/>"
   fi