icnss2: Use event_data before posting event

As part of posted event, event_data is getting freed.
Check for FW crashed using event_data after posting
event can be incorrect since event_data might have been
freed. Move FW crashed check using event_data after
posting event.

Change-Id: Ie82a0b7b4ceb40063318ab2d926b9c14412fb2c9
Signed-off-by: Naman Padhiar <quic_npadhiar@quicinc.com>