ftrace: move pc counter in irqtrace

The assigning of the pc counter is in the wrong spot in the
check_critical_timing function. The pc variable is used in the
out jump.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/trace/trace_irqsoff.c

@@ -142,11 +142,11 @@ check_critical_timing(struct trace_array *tr,
 
 	local_save_flags(flags);
 
+	pc = preempt_count();
+
 	if (!report_latency(delta))
 		goto out;
 
-	pc = preempt_count();
-
 	spin_lock_irqsave(&max_trace_lock, flags);
 
 	/* check if we are still the max latency */