fix potentially wrong-sign zero in cproj functions at infinity

[musl] / src / math / s390x / fmaf.c

#include <math.h>

float fmaf(float x, float y, float z)
{
        __asm__ ("maebr %0, %1, %2" : "+f"(z) : "f"(x), "f"(y));
        return z;
}