ALSA: pcm - fix mmap capability check for the snd-dummy driver

The snd-dummy driver (fake_buffer configuration) uses the ops->page
callback for the mmap operations. Allow mmap for this case, too.

Cc: <[email protected]>
Fixes: c4824ae ("ALSA: pcm: Fix mmap capability check")
Signed-off-by: Jaroslav Kysela <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

Author: perexg

sound/core/pcm_native.c

@@ -246,7 +246,7 @@ static bool hw_support_mmap(struct snd_pcm_substream *substream)
 	if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 		return false;
 
-	if (substream->ops->mmap)
+	if (substream->ops->mmap || substream->ops->page)
 		return true;
 
 	switch (substream->dma_buffer.dev.type) {