The branch main has been updated by jhb:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=13bebcd35f0a19c7c96e11fb336c99ead7f1fe92

commit 13bebcd35f0a19c7c96e11fb336c99ead7f1fe92
Author:     John Baldwin <[email protected]>
AuthorDate: 2022-04-21 17:29:14 +0000
Commit:     John Baldwin <[email protected]>
CommitDate: 2022-04-21 17:29:14 +0000

    pcm: Initialize pcm_devclass in sound_modevent.
    
    Reviewed by:    imp
    Differential Revision:  https://reviews.freebsd.org/D34998
---
 sys/dev/sound/pcm/sound.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/dev/sound/pcm/sound.c b/sys/dev/sound/pcm/sound.c
index b94ed8e943bb..ffb6db66a179 100644
--- a/sys/dev/sound/pcm/sound.c
+++ b/sys/dev/sound/pcm/sound.c
@@ -1429,6 +1429,7 @@ sound_modevent(module_t mod, int type, void *data)
        ret = 0;
        switch (type) {
                case MOD_LOAD:
+                       pcm_devclass = devclass_create("pcm");
                        pcmsg_unrhdr = new_unrhdr(1, INT_MAX, NULL);
                        break;
                case MOD_UNLOAD:

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