ALSA: compress_offload: improve file descriptors installation for dma-buf

Avoid to use single dma_buf_fd() call for both directions. This code
ensures that both file descriptors are allocated before fd_install().

Link: https://lore.kernel.org/linux-sound/6a923647-4495-4cff-a253-b73f48cfd0ea@stanley.mountain/


Fixes: 04177158 ("ALSA: compress_offload: introduce accel operation mode")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20241217100726.732863-1-perex@perex.cz