#2250 newdet limitation

[Barton Willis]

The function newdet sometimes gives a Lisp error:

(%i1) m : genmatrix(lambda([a,b], random(10)),30,30)$

(%i2) newdet(m);
Maxima encountered a Lisp error:
value 310235040 is not of the expected type (UNSIGNED-BYTE 24).

[Barton Willis]

Append a label "newdet." This bug is still in Maxima 5.47