Fix compiler warning.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4676 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/nbd.c b/nbd.c
index fcf0339..c7d63d3 100644
--- a/nbd.c
+++ b/nbd.c
@@ -388,7 +388,7 @@
 	}
 
 	if (len > sizeof(data)) {
-		LOG("len (%u) is larger than max len (%lu)",
+		LOG("len (%u) is larger than max len (%u)",
 		    len, sizeof(data));
 		errno = EINVAL;
 		return -1;