efi_loader: typo non-volatile in efi_var_restore

It is volatile variables that we do not allow to be restored from file.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/lib/efi_loader/efi_var_file.c b/lib/efi_loader/efi_var_file.c
index 3d58caa..de9ba8d 100644
--- a/lib/efi_loader/efi_var_file.c
+++ b/lib/efi_loader/efi_var_file.c
@@ -176,7 +176,7 @@
 		data = var->name + u16_strlen(var->name) + 1;
 
 		/*
-		 * Secure boot related and non-volatile variables shall only be
+		 * Secure boot related and volatile variables shall only be
 		 * restored from U-Boot's preseed.
 		 */
 		if (!safe &&