Nicolas Iooss reports:
In sepol_ibendport_key_create(), if sepol_ibendport_alloc_ibdev_name()
fails to allocate tmp_key->ibdev_name, sepol_ibendport_key_free() is
called to free the memory associated with tmp_key, which results in
free() being called on uninitialized tmp_key->ibdev_name.

This issue is reported by clang's static analyzer with the following
message:

    ibendport_record.c:115:2: warning: 1st function call argument is an
    uninitialized value
            free(key->ibdev_name);
            ^~~~~~~~~~~~~~~~~~~~~

Signed-off-by: James Carter <jwcart2@tycho.nsa.gov>