[PATCH] ALSA: aw2: avoid casting function pointers

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

clang-16 started warning about incompatible function pointers here:

sound/pci/aw2/aw2-alsa.c:363:11: error: cast from 'void (*)(struct snd_pcm_substream *)' to 'snd_aw2_saa7146_it_cb' (aka 'void (*)(void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
  363 |                                                     (snd_aw2_saa7146_it_cb)
      |                                                     ^~~~~~~~~~~~~~~~~~~~~~~
  364 |                                                     snd_pcm_period_elapsed,
      |                                                     ~~~~~~~~~~~~~~~~~~~~~~
sound/pci/aw2/aw2-alsa.c:392:10: error: cast from 'void (*)(struct snd_pcm_substream *)' to 'snd_aw2_saa7146_it_cb' (aka 'void (*)(void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
  392 |                                                    (snd_aw2_saa7146_it_cb)
      |                                                    ^~~~~~~~~~~~~~~~~~~~~~~
  393 |                                                    snd_pcm_period_elapsed,
      |                                                    ~~~~~~~~~~~~~~~~~~~~~~

Add a forward declaration for struct snd_pcm_substrea to allow it to just
use the correct prototype.

Fixes: 98f2a97f207a ("[ALSA] Emagic Audiowerk 2 ALSA driver.")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 sound/pci/aw2/aw2-saa7146.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/pci/aw2/aw2-saa7146.h b/sound/pci/aw2/aw2-saa7146.h
index b5c5a71c0ac3..3a3de56b9b07 100644
--- a/sound/pci/aw2/aw2-saa7146.h
+++ b/sound/pci/aw2/aw2-saa7146.h
@@ -19,11 +19,12 @@
 
 #define NUM_STREAM_CAPTURE_ANA 0
 
-typedef void (*snd_aw2_saa7146_it_cb) (void *);
+struct snd_pcm_substream;
+typedef void (*snd_aw2_saa7146_it_cb) (struct snd_pcm_substream *);
 
 struct snd_aw2_saa7146_cb_param {
 	snd_aw2_saa7146_it_cb p_it_callback;
-	void *p_callback_param;
+	struct snd_pcm_substream *p_callback_param;
 };
 
 /* definition of the chip-specific record */
-- 
2.39.2