icnss2: Avoid qmi register/unregister in case of qmi failure

During server arrive icnss driver exchanges qmi
messages with wlan fw. When any qmi message failure is
happening, icnss driver is releasing qmi handle and
registering it. This qmi un-registration is leading to
a server exit event get scheduled. Ideally, when
fw goes down, server exit should come from qmi side.
So, with this change avoid calling qmi handle release
if any qmi message send fail happens.

Change-Id: Ifeae3eaca6ae3fb2760612c697e602f884f27ac7
Signed-off-by: Sandeep Singh <sandsing@codeaurora.org>