CRAS: alsa_card - handle null ucm in echo ref path

The card's ucm pointer might be null, if it is, then skip the echo
reference check as there can't be one.

Change-Id: I5eb4a3dd51d15ae6d3ce95a43cfa310ac5e1ae37
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1226926
1 file changed