vnc: Fix compile error on x86_64 with -D_VNC_DEBUG=1

cc1: warnings being treated as errors
vnc-auth-sasl.c: In function ‘vnc_client_write_sasl’:
vnc-auth-sasl.c:50: error: format ‘%d’ expects type ‘int’, but argument 4 has type ‘size_t’
vnc-auth-sasl.c:50: error: format ‘%d’ expects type ‘int’, but argument 5 has type ‘size_t’
make: *** [vnc-auth-sasl.o] Error 1
Signed-off-by: NCorentin Chary <corentincj@iksaif.net>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

vnc-auth-sasl.c

@@ -47,7 +47,8 @@ long vnc_client_write_sasl(VncState *vs)
 {
     long ret;
 
-    VNC_DEBUG("Write SASL: Pending output %p size %d offset %d Encoded: %p size %d offset %d\n",
+    VNC_DEBUG("Write SASL: Pending output %p size %zd offset %zd "
+              "Encoded: %p size %d offset %d\n",
               vs->output.buffer, vs->output.capacity, vs->output.offset,
               vs->sasl.encoded, vs->sasl.encodedLength, vs->sasl.encodedOffset);