[PATCH] lib/util/util.c: move null-check before use

[Aurélien Aptel]

Hi,

This patch moves the null pointer check *before* the pointer is used in
the strlen() call.
    
- still allocate the `fname` array on the stack
- still compiles under C90 definition/code mixing rules

Please review&push

Thanks!

-- 
Aurélien Aptel / SUSE Labs Samba Team
GPG: 1839 CB5F 9F5B FB9B AA97  8C99 03C8 A49B 521B D5D3
SUSE Linux GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG
Nürnberg)
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