msm: npu: Fix use after free issue

There is possibility that network will be used after free.
This change is to fix this issue.

Change-Id: I39aa81ddc4a7d1801b2f7157aa21f0051ff2d5a5
Signed-off-by: Gao Wang <quic_gaowang@quicinc.com>
(cherry picked from commit c29b6939)