If we fail to install our own action, the contents of oldact are noise
anyway, so we can't use them to decide anything; and, in any case, we
didn't replace the prior action, so have no duty to restore it.
In the process, restructure and comment the code to make it easier to
follow what's going on and why. Package a conditional in a lambda to
make the #if-ery less problematic. This should also make it easier to
hack any other complications into the condition, should they arise.
Change-Id: I712335ee27f68a8594dc2fe6441a91f686967da2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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