update-smart-drivedb.in: Don't use 'let' which is bash specific.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk@5358 4ea69e1a-61f1-4043-bf83-b5c94c648137

smartmontools/ChangeLog

@@ -2,6 +2,8 @@ $Id$
 
 2022-04-24  Christian Franke  <franke@computer.org>
 
+	update-smart-drivedb.in: Don't use 'let' which is bash specific.
+
 	update-smart-drivedb.in: Don't use semicolon in sed scripts.
 	This also fixes a syntax error if sed requires ';' before '}'.
 

smartmontools/update-smart-drivedb.in

@@ -527,7 +527,7 @@ gpg_verify()
   # Remove temp home dir, retry on failure
   i=0
   while ! out=`rm -f -r "$gnupgtmp" 2>&1`; do
-    let ++i
+    i=$((i+1))
     if [ $i -ge 10 ]; then
       echo "$out" >&2; break
     fi