[Backport r51221 | neal.norwitz -- the original commit message is wrong; this code is only used if WITHOUT_COMPLEX is *not* defined, which is the common case for Python builds.] This code is actually not used unless WITHOUT_COMPLEX is defined. However, there was no error checking that PyFloat_FromDouble returned a valid pointer. I believe this change is correct as it seemed to follow other code in the area. Klocwork # 292.