Frees resources associated with a session instance
#include <libssh2.h>
int libssh2_session_free(LIBSSH2_SESSION *session);
Frees all resources associated with a session instance. Typically called after libssh2_session_disconnect_ex(3)
Return 0 on success or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se.