wcnss: Prevent access to WCNSS driver after a failure

Once the WCNSS driver trigger fails, the WCNSS platform driver main
environment is set to NULL. Any further access to WCNSS platform driver
should be prevented after this.

Change-Id: I6d391a347a144c31b70db0fd74904e5d1e020692
CRs-Fixed: 458741
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>
msm: kgsl: Remove extra call to sync_fence_put()

sync_fence_put is called twice and cause NULL pointer dereference.

Change-Id: Ia29e676af28d9040d1ba1ee8669f1306cc8b4035
Signed-off-by: Alex Wong <waiw@codeaurora.org>