[PATCH] lib/util/idtree.c: fix undefined behaviour by using uint in left-shift

[Aurélien Aptel]

Hi,
    
Using negative values (~0 with no suffix is signed and == -1) on the
left-side of a left-shift operation is an Undefined Behaviour in C.

Please review&push

Thanks!

-- 
Aurélien Aptel / SUSE Labs Samba Team
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SUSE Linux GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG
Nürnberg)
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