smb: align durable reconnect v2 context to 8 byte boundary

Add a 4-byte Pad to create_durable_handle_reconnect_v2 so the DH2C
create context is 8 byte aligned.
This avoids malformed CREATE contexts on reconnect.
Recent change removed this Padding, adding it back.

Fixes: 81a45de ("smb: move create_durable_handle_reconnect_v2 to common/smb2pdu.h")

Signed-off-by: Bharath SM <bharathsm@microsoft.com>
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: bharathsm-ms

fs/smb/common/smb2pdu.h

@@ -1293,6 +1293,7 @@ struct create_durable_handle_reconnect_v2 {
 	struct create_context_hdr ccontext;
 	__u8   Name[8];
 	struct durable_reconnect_context_v2 dcontext;
+	__u8 Pad[4];
 } __packed;
 
 /* See MS-SMB2 2.2.14.2.12 */