oss-fuzz: Issue 378159141: opennavsurf-bag:bag_read_fuzzer: ASSERT: hobj->idx < heap->nused

[selimnairb]

oss-fuzz: https://issues.oss-fuzz.com/issues/378159141
details: https://oss-fuzz.com/testcase-detail/4677183692931072

[selimnairb]

See also: oss-fuzz: https://issues.oss-fuzz.com/issues/472769348