util/uuid: Remove UUID_FMT_LEN

Dangerous and now unused.

Cc: Fam Zheng <fam@euphon.net>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: "Denis V. Lunev" <den@openvz.org>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
(cherry picked from commit 4ef9d97)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

include/qemu/uuid.h

@@ -78,8 +78,7 @@ typedef struct {
                  "%02hhx%02hhx-" \
                  "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
 
-#define UUID_FMT_LEN 36
-#define UUID_STR_LEN (UUID_FMT_LEN + 1)
+#define UUID_STR_LEN (36 + 1)
 
 #define UUID_NONE "00000000-0000-0000-0000-000000000000"