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json-parser: Fix potential NULL pointer segfault
Report from smatch: json-parser.c:474 parse_object(62) error: potential null derefence 'dict'. json-parser.c:553 parse_array(75) error: potential null derefence 'list'. Label 'out' in json-parser.c can be called with list == NULL which is passed to QDECREF. Modify QDECREF to handle a NULL argument (inline function qobject_decref already handles them, too). Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
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