e.g. fdo80788-1.odt

 Invalid read of size 2
    at 0x3C031438: SwLinePortion::IsParaPortion() const (porlin.hxx:132)
    by 0x3C05EC56: SwTextFormatter::BuildPortions(SwTextFormatInfo&) (itrform2.cxx:679)
    by 0x3C05F2A2: SwTextFormatter::FormatLine(int) (itrform2.cxx:1550)

  Address 0x3576189e is 30 bytes inside a block of size 40 free'd
    at 0x4C2ED4A: free (vg_replace_malloc.c:530)
    by 0x4E56939: rtl_freeMemory_SYSTEM(void*) (alloc_global.cxx:279)
    by 0x4E56978: rtl_freeMemory (alloc_global.cxx:349)
    by 0x4E5501B: rtl_cache_free (alloc_cache.cxx:1230)
    by 0xDACE741: FixedMemPool::Free(void*) (mempool.cxx:49)
    by 0x3C043AB8: SwTextPortion::operator delete(void*, unsigned long) (portxt.hxx:55)
    by 0x3C043B05: SwHangingPortion::~SwHangingPortion() (porrst.hxx:98)
    by 0x3C043F47: std::default_delete<SwHangingPortion>::operator()(SwHangingPortion*) const (unique_ptr.h:76)
    by 0x3C044070: std::unique_ptr<SwHangingPortion, std::default_delete<SwHangingPortion> >::reset(SwHangingPortion*) (unique_ptr.h:344)
    by 0x3C0888C3: std::unique_ptr<SwHangingPortion, std::default_delete<SwHangingPortion> >::operator=(decltype(nullptr)) (unique_ptr.h:280)
    by 0x3C0888DB: SwTextGuess::ClearHangingPortion() (guess.hxx:51)

since...

commit a706bb06
Date:   Wed Jan 11 14:26:47 2017 +0200

    new loplugin: useuniqueptr: sw part 1

Change-Id: I614029474d684ddcccd4f4a5e9787fe6c19d8fd2