smb: client: fix cifs_pick_channel when channel needs reconnect

smb: client: fix cifs_pick_channel when channel needs reconnect

cifs_pick_channel iterates candidate channels using cur. The
reconnect-state test mistakenly used a different variable.

This checked the wrong slot and would cause us to skip a healthy channel
and to dispatch on one that needs reconnect, occasionally failing
operations when a channel was down.

Fix by replacing for the correct variable.

Fixes: fc43a8ac396d ("cifs: cifs_pick_channel should try selecting active channels")
Cc: stable@vger.kernel.org
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>