getenv() returns an string of unknown size, so Coverity warns that it
might be used to overflow the stack in the call chain off
conf_read_simple().
To avoid that, wisdom says copy to an string of known size and pass
that.
Change-Id: I9e468de0ae66429062027f58fe0a0a4e1197218f
Coverity-ID: 150819
Signed-off-by: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
(cherry picked from commit 0307d6ea5fa361abe5c9fb1872f9dc8256208ee0)