Use parent not CuMatrix

Author: kshyatt

test/libraries/cusolver/dense.jl

@@ -954,6 +954,6 @@ end
         @test Array(func(d_Ah)) ≈ func(Ah)
     end
     @testset for func in (cbrt,) # have to dispatch explicitly
-        @test Array(CuMatrix(func(Hermitian(d_Ah)))) ≈ func(Hermitian(Ah))
+        @test Array(parent(func(Hermitian(d_Ah)))) ≈ func(Hermitian(Ah))
     end
 end