Fix some win32 compile warnings

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6984 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/nbd.c b/nbd.c
index 77b3e16..1586ea7 100644
--- a/nbd.c
+++ b/nbd.c
@@ -579,7 +579,7 @@
 	if ((request.from + request.len) > size) {
 	        LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
 		    ", Offset: %" PRIu64 "\n",
-		     request.from, request.len, size, dev_offset);
+                    request.from, request.len, (uint64_t)size, dev_offset);
 		LOG("requested operation past EOF--bad client?");
 		errno = EINVAL;
 		return -1;