opensolaris cyclic xcall: no need for special handling of curcpu

smp_rendezvous_cpus already properly handles current CPU case
and non-SMP case.

MFC after:	3 weeks

sys/cddl/dev/cyclic/i386/cyclic_machdep.c

@@ -121,13 +121,7 @@ static void reprogram(cyb_arg_t arg, hrtime_t exp)
 
 static void xcall(cyb_arg_t arg, cpu_t *c, cyc_func_t func, void *param)
 {
-	/*
-	 * If the target CPU is the current one, just call the
-	 * function. This covers the non-SMP case.
-	 */
-	if (c == &solaris_cpu[curcpu])
-		(*func)(param);
-	else
+
 	smp_rendezvous_cpus((cpumask_t) (1 << c->cpuid), NULL,
 	    func, smp_no_rendevous_barrier, param);
 }