Git versions of glib, goffice, gnumeric, libgsf and libxml2.

Test case: http://jutaky.com/fuzzing/gnumeric_case_007-gog-object.c.2128.xls

$ ssconvert gnumeric_case_007-gog-object.c.2128.xls /tmp/out.gnumeric

==11674==ERROR: AddressSanitizer: SEGV on unknown address 0x0000000000c0 (pc 0x7f56ad36db06 bp 0x7fffdde7f4f0 sp 0x7fffdde7f380 T0)
    #0 0x7f56ad36db05 in gog_object_document_changed gnumeric/goffice/goffice/graph/gog-object.c:2128:6
    #1 0x7f56ad36dd51 in gog_object_document_changed gnumeric/goffice/goffice/graph/gog-object.c:2131:3
    #2 0x7f56ad36dd51 in gog_object_document_changed gnumeric/goffice/goffice/graph/gog-object.c:2131:3
    #3 0x7f56ad3cbc85 in gog_graph_set_property gnumeric/goffice/goffice/graph/gog-graph.c:188:4
    #4 0x7f56a8578517 in object_set_property gnumeric/glib/gobject/gobject.c:1415
    #5 0x7f56a8578517 in g_object_set_valist gnumeric/glib/gobject/gobject.c:2158
    #6 0x7f56a8578b9e in g_object_set gnumeric/glib/gobject/gobject.c:2268
    #7 0x7f56ae9dfcdb in sog_datas_set_sheet gnumeric/gnumeric/src/sheet-object-graph.c:139:2
    #8 0x7f56ae9e9186 in gnm_sog_set_sheet gnumeric/gnumeric/src/sheet-object-graph.c:522:3
    #9 0x7f56ae972350 in sheet_object_set_sheet gnumeric/gnumeric/src/sheet-object.c:577:6
    #10 0x7f5688809155 in ms_excel_chart_read gnumeric/gnumeric/plugins/excel/ms-chart.c:3970:3
    #11 0x7f568863eccd in excel_read_BOF gnumeric/gnumeric/plugins/excel/ms-excel-read.c:7110:4
    #12 0x7f5688639bc5 in excel_read_workbook gnumeric/gnumeric/plugins/excel/ms-excel-read.c:7211:4
    #13 0x7f56885cd221 in excel_enc_file_open gnumeric/gnumeric/plugins/excel/boot.c:170:4
    #14 0x7f56885cec74 in excel_file_open gnumeric/gnumeric/plugins/excel/boot.c:273:2
    #15 0x7f56ad226e30 in go_plugin_loader_module_func_file_open gnumeric/goffice/goffice/app/go-plugin-loader-module.c:282:3
    #16 0x7f56ad23a9b4 in go_plugin_file_opener_open gnumeric/goffice/goffice/app/go-plugin-service.c:685:2
    #17 0x7f56ad2481c8 in go_file_opener_open gnumeric/goffice/goffice/app/file.c:417:2
    #18 0x7f56aebc7874 in workbook_view_new_from_input gnumeric/gnumeric/src/workbook-view.c:1278:3
    #19 0x7f56aebc8460 in workbook_view_new_from_uri gnumeric/gnumeric/src/workbook-view.c:1337:9
    #20 0x4e1031 in convert gnumeric/gnumeric/src/ssconvert.c:721:9
    #21 0x4ded93 in main gnumeric/gnumeric/src/ssconvert.c:913:9
    #22 0x7f56a766378f in __libc_start_main (/usr/lib/libc.so.6+0x2078f)
    #23 0x437c58 in _start (apps/bin/ssconvert+0x437c58)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV gnumeric/goffice/goffice/graph/gog-object.c:2128 gog_object_document_changed

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Juha Kylmänen