platform: msm: sensor: Fix out of bounds and null pointer.

This change fixes out of bounds and null pointer
dereferences in sensor drivers.

Change-Id: I5f8974d3435c2770f6e91809c153a98aa38f52a7
Signed-off-by: Ivan Tiyanov <ivant@codeaurora.org>
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>