Use more accurate variable name

src/shellfu/saturnin.sh

@@ -55,17 +55,17 @@ saturnin__runsc() {
     #
     # Run subcommand $SATURNIN_SUBCOMMAND
     #
-    local lexpath
-    lexpath+="$SATURNIN_LIBEXEC/"
-    lexpath+="$SATURNIN_LIBEXEC_PREFIX$SATURNIN_SUBCOMMAND"
-    debug -v lexpath
+    local binpath   # path to subconnand's binary
+    binpath+="$SATURNIN_LIBEXEC/"
+    binpath+="$SATURNIN_LIBEXEC_PREFIX$SATURNIN_SUBCOMMAND"
+    debug -v binpath
     debug "\$*='$*'"
-    test -x "$lexpath" || {
+    test -x "$binpath" || {
         warn "invalid sub-command: $SATURNIN_SUBCOMMAND"
         saturnin__help
         return "$SHELLFU_EXIT_USAGE"
     }
-    "$lexpath" "$@"
+    "$binpath" "$@"
 }
 
 saturnin__wraphook() {