Crash in git_transport_register #82
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…en newly registered transport is actually called
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git_transport_register will register a callback, then free said callback before returning, resulting in a crash when said callback is to be used.
This patch removes the call to php_git2_cb_free(), and also implements a new helper php_git2_cb_init_copy() that will duplicate fci/fcc (to be freed in php_git2_cb_free if needed).
Ideally we should also free the callback in the unregister method - but considering most transports are likely to survive until the end of execution of the script that might have a lower priority.