https://github.com/ionenwks/iwdevtools/commit/74d7b913a9bea5cfbf59e451d8db4a4c6140cba8
From: Ionen Wolkens <ionen@gentoo.org>
Date: Wed, 16 Mar 2022 09:51:00 -0400
Subject: [PATCH] qa-vdb: fix off-by-one in diff output

This wrongly assumed f1 array was always at least as big as f2

--- a/scripts/qa-vdb
+++ b/scripts/qa-vdb
@@ -203,8 +203,8 @@ vdb-get_libdiff() {
 	# create combined output
 	local -i len=0
 	local o mark changes=false
-	for ((i=0; i < ${#f1[@]}; i++)); do
-		: "${f2[i]:=}"
+	for ((i=0; i < (${#f1[@]}>${#f2[@]}?${#f1[@]}:${#f2[@]}); i++)); do
+		: "${f1[i]:=}${f2[i]:=}"
 		if [[ ${f1[i]} == "${f2[i]}" ]]; then
 			${O[full]} || continue
 			mark=' '