test: Return value from instance_create() is > 0
test: Return value from instance_create() is > 0

... or -EBACKENDNOTAVAILABLE if the backend lib is not found

Signed-off-by: Tushar Gohad <0bb77f197006485a08470695af4d30d45f8c97bc@intel.com>

tsg-/liberasurecode,tsg-/liberasurecode,cedricde/liberasurecode,cedricde/liberasurecode