ASoC: wcd9xxx: check NULL pointer access for wcd9xxx

It may be possible that device up gets called
before slim probe and this leads to NULL pointer
access. Avoid the NULL pointer access before
processing device up.

Change-Id: I53d8deb985d67a19a52165c783f38f176d564fbc
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
1 file changed