MEM: Release rx_buffer after retrieve request

Inside sp_memory_retrieve() ffa_rx_release() wasn't called after calling
ffa_mem_retrieve_req_rxtx(). This resulted in some later error as the
SPMC could not access the buffer afterwards.

Signed-off-by: Jelle Sels <jelle.sels@arm.com>
Change-Id: I0da6026c9bcb8ce64b2741474a4daaff896fb97c
2 files changed