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- In add_event2():

  Turn the first error condition checking whether there is room for an
  extra event2 data structure into an assertion. The platform layer is
  responsible for choosing an appropriate event log buffer size based
  on the number of measurements it expects. If this assertion fires,
  the platform macro EVENT_LOG_SIZE should be adjusted and the
  firmware recompiled.

  Call this assumption out in the function documentation.

  Also remove the second error condition check, which is a subset of
  the first one and thus is redundant.

  As a result of these changes, add_event2() can no longer fail. Thus,
  change its return type from int to void.

  Also, the 'size_of_event' local variable is now unused in release
  builds so remove it and move its value into the assertion.

Change-Id: I113fc141de59708b20435a0c7126255561ab7786
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>