efi_loader: rtc_mktime() called twice

Don't call rtc_mktime() twice with the same argument in
efi_variable_authenticate().

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 4d49fd6..efaba86 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -577,7 +577,7 @@
 	}
 
 	/* finished checking */
-	*time = rtc_mktime(&tm);
+	*time = new_time;
 	ret = EFI_SUCCESS;
 
 err: