ASoC: wcd9xxx: Fix crash when enable mbhc driver logs

Fix crash by avoiding NULL pointer access when mbhc driver
logs are enabled.

Change-Id: I6575a215b035bafb3fe85d5fc3ff72f985fe7a25
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
1 file changed