Move pre-post-hook wrapping code to a routine

src/ffoo/saturnin_common.sh

@@ -55,9 +55,21 @@ saturnin_runsc() {
         saturnin_help
         return $FFOO_EXIT_USAGE
     }
+    saturnin_wraphook "$lexpath" "$@"
+}
+
+saturnin_wraphook() {
+    #
+    # Wrap command "$@" in hooks
+    #
+    # Run pre hook, then "$@", then post hook.  Always exit
+    # with status of "$@", even if hooks fail.  Ignore
+    # post-hook if "$@" failed.
+    #
+    local es=0
     saturnin_runhook pre
-    "$lexpath" "$@" || return $?
-    sc_es=$?
+    "$@" || return $?
+    es=$?
     saturnin_runhook post
-    return $sc_es
+    return $es
 }