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: 81a45de432c6 ("smb: move create_durable_handle_reconnect_v2 to common/smb2pdu.h")

Signed-off-by: Bharath SM <[e-mail]>
Reviewed-by: Paulo Alcantara (Red Hat) <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/smb/common/smb2pdu.h

···
 	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 */