soc: qcom: msm_glink_pkt: Fix the lock ownership

Do not unlock the mutex that has not been locked earlier and fix any
associated warnings.

CRs-Fixed: 922243
Change-Id: I0d96ed482f8469b8d65d2a8806be26b8848760e3
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>