TIFFWriteDirectoryTagTransferfunction() : fix NULL dereferencing
http://bugzilla.maptools.org/show_bug.cgi?id=2833 we must check the pointer is not NULL before memcmp() the memory
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http://bugzilla.maptools.org/show_bug.cgi?id=2833 we must check the pointer is not NULL before memcmp() the memory
mentioned in issue rouault/test-libtiff-issues#137
·mentioned in issue rouault/test-libtiff-issues#137