msm: camera: isp: Fix warning and errors based on static analysis

This change fixes the warning/errors from static analysis

Conflicts:
	drivers/media/platform/msm/camera_v2/isp/msm_buf_mgr.c
	drivers/media/platform/msm/camera_v2/isp/msm_isp_axi_util.c
	drivers/media/platform/msm/camera_v2/isp/msm_isp_stats_util.c
	drivers/media/platform/msm/camera_v2/isp/msm_isp_util.c

CRs-fixed: 992942
Change-Id: Iaf90ab4c1d17f903d03458d76cab1b4c0a5c8836
Signed-off-by: Jing Zhou <jzhou70@codeaurora.org>
Signed-off-by: Suman <Mukherjee&lt;sumam@codeaurora.org>