[gnutls-devel] GnuTLS | lib: fix two segfault issues caused by freeing uninitialized buf (!1807)

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Xin Long commented: https://gitlab.com/gnutls/gnutls/-/merge_requests/1807#note_1772021419

buf is actually used in _gnutls13_recv_end_of_early_data(): when buf.length != 0, it returns error. Also, I'm not sure if buf.length == 0 means buf.allocd, so I just fixed the issue by simply adding a _gnutls_buffer_init() call in the beginning of the function in the version 3 post.

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