[ALSA] powermac - Fix Oops when conflicting with aoa driver

Fixed Oops when conflictin with aoa driver due to lack of
i2c initialization.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/ppc/keywest.c b/sound/ppc/keywest.c
index 59482a4cd446..272ae38e9b18 100644
--- a/sound/ppc/keywest.c
+++ b/sound/ppc/keywest.c
@@ -117,6 +117,9 @@ int __init snd_pmac_tumbler_post_init(void)
 {
         int err;
         
+        if (!keywest_ctx || !keywest_ctx->client)
+                return -ENXIO;
+
         if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
                 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
                 return err;