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During USAC decoding (ff_aac_usac_decode_frame), configuration elements
can be mapped and instantiated via che_configure(). For newly allocated
ChannelElement structs, che_configure calls sbr_ctx_alloc_init() which
dynamically allocates ac->che[type][id]. However, che_configure did not
subsequently map the output pointer of the nested SingleChannelElement
elements back to their statically-sized internal ret_buf arrays, causing
a null pointer dereference during IMDCT windowing.
The fix explicitly initializes these pointers following allocation.
Signed-off-by: Marvin Scholz <epirat07@gmail.com>
(cherry picked from commit 8319541103)