TT#120752 Fix b821e00: move main function load close to validation

It produces no functional changes but align code better with
Sipwise/ngcpcfg style. We normally check the file availability and
load the file the next line.

Change-Id: Ifebddc452f7701fd02a85a8d3273edc89b7fd21a

scripts/edit

@@ -14,6 +14,9 @@ if ! [ -r "${FUNCTIONS}"/main ] ; then
   exit 1
 fi
 
+# shellcheck disable=SC1090
+. "${FUNCTIONS}"/main
+
 if [ -z "${EDITOR:-}" ] ; then
   if [ -x "/usr/bin/vim" ]; then
     EDITOR="/usr/bin/vim"
@@ -23,9 +26,6 @@ if [ -z "${EDITOR:-}" ] ; then
   fi
 fi
 
-# shellcheck disable=SC1090
-. "${FUNCTIONS}"/main
-
 # main script
 RC=0
 file=""