PVS-Studio warning V595 for daoParanoia

static long i_stage2_each(root_block *root, v_fragment *v,
  void(*callback)(long,int))
{
  cdrom_paranoia *p=v->p;
  long dynoverlap=p->dynoverlap/2*2;

  if(!v || !v->one)return(0);
  ...
}

This suspicious code was found in daoParanoia project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'v' pointer was utilized before it was verified against nullptr. Check lines: 532, 535. daoParanoia  paranoia.c  532

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