msm: camera: Fix for camera crash

In msm_server_control function add a check for src
and dest before calling memcpy function to avoid
kernel crash

CRs-Fixed: 444081
Signed-off-by: Suresh Vankadara <svankada@codeaurora.org>

Change-Id: I814f654c223892a21d585fef31bd6ef75254c108