[PATCHES] fix some build warnings

[Günther Deschner]

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Hi,

after building samba with gcc6, here are some first build warning fixes.

Please review & push,

Thanks,
Guenther
- -- 
Günther Deschner                    GPG-ID: 8EE11688
Red Hat                         gdeschner at redhat.com
Samba Team                              gd at samba.org
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