uuid: Make null_uuid static

So that it doesn't have to be zeroed at each call.

Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-Id: <1474432046-325-3-git-send-email-famz@redhat.com>

diff --git a/util/uuid.c b/util/uuid.c
index 6815904..f0c1eeb 100644 (file)
--- a/util/uuid.c
+++ b/util/uuid.c
@@ -40,7 +40,7 @@ void qemu_uuid_generate(QemuUUID *uuid)
 
 int qemu_uuid_is_null(const QemuUUID *uu)
 {
-    QemuUUID null_uuid = { 0 };
+    static QemuUUID null_uuid;
     return memcmp(uu, &null_uuid, sizeof(QemuUUID)) == 0;
 }