Fix a use-after-free in qrx_proces_pkt

Fix a use-after-free in qrx_proces_pkt

When calling qrx_relocate_buffer, both the rxe and the pointer to the token
may be changing locations. We have to use a temporary copy of the token
pointer to avoid referencing the old location of the rxe.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22368)