drivers: qcom: rpmh: Fix NULL pointer issue in msm_bus_commit_data

Checked added for cur_rsc in the beginning of msm_bus_commit_data
to avoid NULL pointer dereference issue.

Change-Id: I6c1cec9707b9c1843db4b4c86b4881a09ef6b41c
Signed-off-by: Maria Yu <aiquny@codeaurora.org>