[PATCH] ALSA: ac97: fix build regression

[Arnd Bergmann <arnd@xxxxxxxxxx>]

From: Arnd Bergmann <arnd@xxxxxxxx>

The ac97_bus_type structure is no longer declared in this file:

sound/ac97/bus.c: In function 'ac97_codec_add':
sound/ac97/bus.c:112:27: error: 'ac97_bus_type' undeclared (first use in this function); did you mean 'bus_type'?
  112 |         codec->dev.bus = &ac97_bus_type;
      |                           ^~~~~~~~~~~~~
      |                           bus_type
sound/ac97/bus.c:112:27: note: each undeclared identifier is reported only once for each function it appears in
sound/ac97/bus.c: In function 'snd_ac97_codec_driver_register':
sound/ac97/bus.c:191:28: error: 'ac97_bus_type' undeclared (first use in this function); did you mean 'ac97_bus_reset'?
  191 |         drv->driver.bus = &ac97_bus_type;

Include the header that contains the declaration and make sure the definition
is const but not static.

Fixes: 66e82d219924 ("ALSA: mark all struct bus_type as const")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 sound/ac97/bus.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/ac97/bus.c b/sound/ac97/bus.c
index 1dc7965eb14b..5e46b972a3da 100644
--- a/sound/ac97/bus.c
+++ b/sound/ac97/bus.c
@@ -15,6 +15,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
+#include <sound/ac97_codec.h>
 #include <sound/ac97/codec.h>
 #include <sound/ac97/controller.h>
 #include <sound/ac97/regs.h>
@@ -529,7 +530,7 @@ static void ac97_bus_remove(struct device *dev)
 	pm_runtime_disable(dev);
 }
 
-static struct bus_type ac97_bus_type = {
+const struct bus_type ac97_bus_type = {
 	.name		= "ac97bus",
 	.dev_groups	= ac97_dev_groups,
 	.match		= ac97_bus_match,
-- 
2.39.2