Docbook compile warning

[Kornel Benko]

/usr2/src/lyx/lyx-git/src/output_docbook.cpp:770:21: warning: comparison of integer
expressions of different signedness: ‘lyx::depth_type’ {aka ‘long unsigned int’} and
‘int’ [-Wsign-compare] if (abstractDepth != -1 && style.docbookininfo() == "never")
{ ~~~~~~~~~~~~~~^~~~~

	Kornel
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