Make dialect negotiation warning message easier to read

Dialect version and minor version are easier to read in hex

Signed-off-by: Steve French <steve.french@primarydata.com>
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 1270806..0479e3c 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -398,7 +398,7 @@
 		cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 #endif /* SMB311 */
 	else {
-		cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
+		cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 			 le16_to_cpu(rsp->DialectRevision));
 		rc = -EIO;
 		goto neg_exit;