ALSA: compress_offload: import DMA_BUF namespace

The compression offload code cannot be in a loadable module unless it
imports that namespace:

ERROR: modpost: module snd-compress uses symbol dma_buf_get from namespace DMA_BUF, but does not import it.
ERROR: modpost: module snd-compress uses symbol dma_buf_put from namespace DMA_BUF, but does not import it.
ERROR: modpost: module snd-compress uses symbol dma_buf_fd from namespace DMA_BUF, but does not import it.

Fixes: 0417715 ("ALSA: compress_offload: introduce accel operation mode")
Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Shengjiu Wang <[email protected]>
Acked-by: Vinod Koul <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: arndb

sound/core/compress_offload.c

@@ -1247,6 +1247,7 @@ void snd_compr_task_finished(struct snd_compr_stream *stream,
 }
 EXPORT_SYMBOL_GPL(snd_compr_task_finished);
 
+MODULE_IMPORT_NS("DMA_BUF");
 #endif /* CONFIG_SND_COMPRESS_ACCEL */
 
 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)