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Fix some memory issues

Elliott Sales de Andrade requested to merge QuLogic/gobject-introspection:mem-issues into master

Specifically:

  • Fix a possible use-after-free: If g_mapped_file_new fails, then version will be freed, but it was already added to the hash table. This means there could be a use-after-free while doing a lookup on the hash table the next time.
  • Fix possible leak of transitive dependency name: If a transitive dependency appears twice, the original pointer will be removed from the hash table. Since these names were created by g_strsplit, they need to be freed, or they will leak.
Edited by Elliott Sales de Andrade

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