n_free() from trurlib in poldek sources

[Tomasz Wittner]

In poldek-0.18.7/trurlib/nmalloc.c we can see:
[...]
void n_free(void *ptr)
{
    if (ptr)
        free(ptr);
}
[...]
IMvHO this code doesn't make sense - wastes CPU cycles only. Quoitting from 
free(3) manpage:
"If ptr is NULL, no operation is performed."

Please, review and test attached patch. If it's correct, please commit it on 
behalf of me.

-- 
Tomasz Wittner
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