===================================================================
RCS file: /cvs/openbsd/fw_update/fw_install.sh,v
retrieving revision 1.85
retrieving revision 1.86
diff -u -r1.85 -r1.86
--- openbsd/fw_update/fw_install.sh	2021/12/18 22:03:43	1.85
+++ openbsd/fw_update/fw_install.sh	2021/12/18 22:08:04	1.86
@@ -1,5 +1,5 @@
 #!/bin/ksh
-#	$OpenBSD: fw_install.sh,v 1.85 2021/12/18 22:03:43 afresh1 Exp $
+#	$OpenBSD: fw_install.sh,v 1.86 2021/12/18 22:08:04 afresh1 Exp $
 #
 # Copyright (c) 2021 Andrew Hewus Fresh <afresh1@openbsd.org>
 #
@@ -122,7 +122,7 @@
 		set -A _dmesgtail
 		while read -r _line; do
 			_dmesgtail[$_m]="$_line"
-			let _m=$_m+1
+			_m=$(( _m + 1 ))
 		done
 
 		grep -v '^[[:space:]]*#' "$FWPATTERNS" |