efi_loader: description of efi_variable.c

Correct the file description.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index c316bdf..99d2f01 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- *  EFI utils
+ * UEFI runtime variable services
  *
- *  Copyright (c) 2017 Rob Clark
+ * Copyright (c) 2017 Rob Clark
  */
 
 #include <common.h>