__predict_false for pledge

[Michael McConville]

We have a pretty strong guarantee that it can only happen once per
process...


Index: sys/sys/syscall_mi.h
===================================================================
RCS file: /cvs/src/sys/sys/syscall_mi.h,v
retrieving revision 1.11
diff -u -p -r1.11 syscall_mi.h
--- sys/sys/syscall_mi.h        9 Oct 2015 01:17:18 -0000       1.11
+++ sys/sys/syscall_mi.h        26 Oct 2015 15:13:44 -0000
@@ -72,7 +72,8 @@ mi_syscall(struct proc *p, register_t co
        if (lock)
                KERNEL_LOCK();
        pledged = (p->p_p->ps_flags & PS_PLEDGE);
-       if (pledged && !(tval = pledge_check(p, code))) {
+       if (__predict_false(
+           pledged && !(tval = pledge_check(p, code)))) {
                if (!lock)
                        KERNEL_LOCK();
                error = pledge_fail(p, EPERM, tval);