code cleanup: force local var before calling a for loop, make sure it's unset when no longer needed

lib/zzz_main_fct.sh

@@ -25,6 +25,7 @@ read_commandline()
     local want_logfile=false
     local want_conffile=false
     
+    local opt=
     for opt in $@; do
         case $opt in
             "-h"|"--help")
@@ -105,12 +106,15 @@ read_commandline()
                 ;;
         esac
     done
+    unset opt
 
     # If those var are true at that point, something is wrong
     if [[ $want_logfile == true ]] || [[ $want_module == true ]] ||
     [[ $want_conffile == true ]]; then
         syntax_error
     fi
+
+    unset want_conffile want_logfile want_module
 }
 export -f read_commandline
 
@@ -150,6 +154,8 @@ load_autoconf()
     if [[ -n $SYS_CODE && -e $prefix/$SYS_DIST-$SYS_CODE-$SYS_ARCH.conf.sh ]]; then
         . $prefix/$SYS_DIST-$SYS_CODE-$SYS_ARCH.conf.sh
     fi
+
+    unset prefix
 }
 export -f load_autoconf
 
@@ -162,6 +168,7 @@ export -f load_autoconf
 load_configuration()
 {
     if [[ -n $CONFFILES ]]; then
+        local f=
         for f in $CONFFILES; do
             prnt I "Chargement de $f spécifié manuellement."
             if [[ -s $f ]]; then
@@ -171,6 +178,7 @@ load_configuration()
                 die 6 --force
             fi
         done
+        unset f
     else
         prnt I "Chargement de la configuration..."
         if [[ -e $MYPATH/conf/$HOSTNAME.conf.sh ]]; then