Fix make_eig_matrix

Author: kshyatt

test/testsuite/ad_utils.jl

@@ -50,9 +50,7 @@ function make_eig_matrix(T, sz)
     D, V = eig_full(A)
     stabilize_eigvals!(diagview(D))
     Ac = V * D * inv(V)
-    Af = similar(A)
-    Af .= (T <: Real) ? T.(real.(Ac)) : Ac
-    return Af
+    return (eltype(T) <: Real) ? real(Ac) : Ac
 end
 function make_eigh_matrix(T, sz)
     A = project_hermitian!(instantiate_matrix(T, sz))