[master] d311ad3a8 vtc-bisect: Missing variable initialization

[Dridi Boukelmoune]

commit d311ad3a828aba13cc55d885a3b8b3ea375dba57
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Fri Aug 6 11:45:43 2021 +0200

    vtc-bisect: Missing variable initialization

diff --git a/tools/vtc-bisect.sh b/tools/vtc-bisect.sh
index e70c9fff9..69a27af03 100755
--- a/tools/vtc-bisect.sh
+++ b/tools/vtc-bisect.sh
@@ -31,6 +31,8 @@
 set -e
 set -u
 
+SCRIPT=$0
+
 usage() {
 	test $# -eq 1 &&
 	printf 'Error: %s.\n\n' "$1"