libxl: Resolve Coverity FORWARD_NULL
Since the strtok_r call in libxlCapsInitGuests expects a non NULL first
parameter when the third parameter is NULL, we need to check that
the returned 'capabilities' from a libxl_get_version_info call is
not NULL and error out if so since the code expects it.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
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