work around constant folding bug 61144 in gcc 4.9.0 and 4.9.1

[musl] / src / stdio / setbuf.c

#include <stdio.h>

void setbuf(FILE *restrict f, char *restrict buf)
{
        setvbuf(f, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
}