set ISO to file:$ISO, not to file:$1 which is just wrong

diff --git a/grml-debootstrap b/grml-debootstrap
index 60358d3..bac2cd5 100755 (executable)
--- a/grml-debootstrap
+++ b/grml-debootstrap
@@ -845,7 +845,7 @@ if [ -n "$ISO" ] ; then
       file*) # do nothing
       ;;
       *)
       file*) # do nothing
       ;;
       *)

-      ISO=file:$1
+      ISO=file:$ISO

       ;;
    esac
 fi
       ;;
    esac
 fi