solve a crash problem and a memory leak problem #23
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…d in ~PSFFile.psfile.cc, use new validate method, and add m_buffer's NULL judgement to Make the close method reentrant(cause crash).psfinternal.h, add ~PropertyBlock method, new validate method to PSFFile and change m_size to ssize_t.psfpropertyblock.cc, delete pointers in m_propmap to avoid memory leaks.
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psf.cc,remote redundant close in destructor,because it would be called in ~PSFFile.psfile.cc, use new validate method, and add m_buffer's NULL judgement to Make the close method reentrant(cause crash).psfinternal.h, add ~PropertyBlock method, new validate method to PSFFile and change m_size to ssize_t.psfpropertyblock.cc, delete pointers in m_propmap to avoid memory leaks.