I think evil is just lack of goodness. Allah creates all the good, and evil is the result of mankinds gift of free will, and its misuse of that gift in lack of acting on the goodness. Its like darkness, there is no such thing, its just an absence of light. Allah didnt create darkness, just places where light doesnt pass. Similarly Allah didnt create evil, just this is a result of misusing free will. There would be no evil if there were no disobedient mankind or jinns.