Fix clog10 (-0 +/- 0i) (bug 16362)

[Andreas Jaeger]

On 03/28/2014 04:19 PM, Joseph S. Myers wrote:
> This patch fixes the imaginary part of clog10 (-0 ± 0i), which
> should be ±pi / log(10) by analogy with clog (the functions were
> wrongly returning a result with imaginary part ±pi, same as for
> clog, and the tests matched the incorrect result, though both
> functions and tests were correct for the similar case of clog10 (-inf
> ± 0i)).  Tested x86_64 and x86.

ok, thanks,

Andreas
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