i2c-msm-v2: Add NULL pointer check on i2c messages

Add check in i2c driver to ensure the client passes valid messages
for i2c transfer.

Change-Id: I75ceee649d387e4324155c01d0c1e8a40342dff5
Signed-off-by: Vipin Deep Kaur <vkaur@codeaurora.org>
1 file changed