msm: camera: Fix various small issues in cpp driver

Add NULL check for fw_name_bin before freeing it.
Release cpp_dev mutex in error cases, Length check
msg_len for cpp info frames.

Change-Id: I5155645e7c2e22739737dc8fbddce37839644516
CRs-Fixed: 507190, 506036, 506033
Signed-off-by: Hariram Purushothaman <hpurus@codeaurora.org>
2 files changed