soc: qcom: check q6 data before using it in pil mss

Check q6 data if ERR or NULL before using it in
pil mss to avoid NULL pointer dereference.

Change-Id: I966f42b099effd0d0b97f87848152c8ae82a8a7c
Signed-off-by: Maria Yu <aiquny@codeaurora.org>