fix return value of ungetc when argument is outside unsigned char range

[musl] / src / math / arm / sqrt.c

#include <math.h>

#if __ARM_PCS_VFP || (__VFP_FP__ && !__SOFTFP__)

double sqrt(double x)
{
        __asm__ ("vsqrt.f64 %P0, %P1" : "=w"(x) : "w"(x));
        return x;
}

#else

#include "../sqrt.c"

#endif