Pathing for diffconfig in prepare (#605)

* Pathing for diffconfig in prepare

* Pathing for diffconfig in prepare Arch specific

linux-tkg-config/prepare

@@ -1762,8 +1762,13 @@ CONFIG_DEBUG_INFO_BTF_MODULES=y\r
       if [ -z "$_diffconfig_name" ]; then
         echo 'No file name given, not generating config fragment.'
       else (
-        prev_pwd="${PWD:-$(pwd)}"
-        cd "$_where"
+        if [ "$_distro" = "Arch" ] || [ "$_ispkgbuild" = "true" ]; then
+        prev_pwd="${PWD:-$(pwd)}/linux-src-git"
+        cd "$_where" || exit
+        else
+            prev_pwd="${PWD:-$(pwd)}"
+            cd "$_where" || exit
+        fi
         "${prev_pwd}/scripts/diffconfig" -m "${prev_pwd}/.config.orig" "${prev_pwd}/.config" > "$_diffconfig_name"
       ) fi
     fi