fix child method: off-by-one error: child(0) == child(1)
fix child method: off-by-one error: child(0) == child(1)

Visya/libxmljs,libxmljs/libxmljs,hildjj/libxmljs,gagern/libxmljs,CodeFridge/libxmljs_mem,rc0x03/libxmljs,Visya/libxmljs,sergeche/libxmljs,polotek/libxmljs,rc0x03/libxmljs,Konsus/libxml,polotek/libxmljs,Konsus/libxml,hildjj/libxmljs,gagern/libxmljs,rchipka/libxmljs,Konsus/libxml,rchipka/libxmljs,sergeche/libxmljs,CodeFridge/libxmljs_mem,libxmljs/libxmljs,sergeche/libxmljs,improvisio-software/libxmljs,rc0x03/libxmljs,hildjj/libxmljs,improvisio-software/libxmljs,improvisio-software/libxmljs,rchipka/libxmljs,Visya/libxmljs,libxmljs/libxmljs,gagern/libxmljs,CodeFridge/libxmljs_mem,polotek/libxmljs