[PATCH 3 of 4][SMB3] multichannel: use pointer for binding channel

[Steve French]

Add a cifs_chan pointer in struct cifs_ses that points to the channel
currently being bound if ses->binding is true.

Previously it was always the channel past the established count.

This will make reconnecting (and rebinding) a channel easier later on.

Signed-off-by: Aurelien Aptel <aaptel at suse.com>
Signed-off-by: Steve French <stfrench at microsoft.com>

-- 
Thanks,

Steve
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