grub.cfg: split up try_user_config

in the next revision, i will add ESP paths

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/grub/config/grub.cfg

@@ -61,15 +61,19 @@ if [ -f (cbfsdisk)/keymap.gkb ]; then
 	keymap (cbfsdisk)/keymap.gkb
 fi
 
-function try_user_config {
+function really_try_user_config {
 	set root="${1}"
 
+	if [ -f /"${2}"/grub.cfg ]; then
+		unset superusers
+		configfile /"${2}"/grub.cfg
+	fi
+}
+
+function try_user_config {
 	# The @/... entries are for cases where the BTRFS filesystem is being used
 	for dir in boot grub grub2 boot/grub boot/grub2 @/boot @/grub @/grub2 @/boot/grub @/boot/grub2; do
-		if [ -f /"${dir}"/grub.cfg ]; then
-			unset superusers
-			configfile /"${dir}"/grub.cfg
-		fi
+		really_try_user_config "${1}" "${dir}"
 	done
 }
 function search_grub {