lib/math/test_div64: Fix error message formatting
Align the expected result with one actually produced for easier visual
comparison; this has to take into account what the format specifiers
will actually produce rather than the characters they consist of. E.g.:
test_div64: ERROR:
10000000ab275080 /
00000009 =>
01c71c71da20d00e,
00000002
test_div64: ERROR: expected value =>
0000000013045e47,
00000001
(with a failure induced by setting bit #60 of the divident).
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>