fix hook_statx nullpointer log

hook_statx(int dirfd, const char* path, int flags, unsigned int mask,

           struct ::statx* buf) {

    bool follow = (flags & AT_SYMLINK_NOFOLLOW) == 0;

    // When AT_EMPTY_PATH is set, path may legally be nullptr or "".

    // In that case it is an fstat-style call on an fd; forward directly to

    // the kernel to avoid a null-pointer dereference in fmt::format.

    if(path == nullptr || (flags & AT_EMPTY_PATH) != 0) {

        return gsl::narrow_cast<int>(syscall_no_intercept_wrapper(

                SYS_statx, dirfd, path, flags, mask, buf));

    }

    LOG(DEBUG,

        "{}() called with dirfd: '{}', path: \"{}\", flags: '{}', mask: '{}', buf: '{}'",

        __func__, dirfd, path, flags, mask, fmt::ptr(buf));