OSV-2023-1071 Heap-use-after-free in igraph_pajek_yyparse

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=63609 Crash type: Heap-use-after-free READ 11 Crash state: igraphpajekyyparse igraphreadgraphpajek readpajek.cpp...