trace: Fix build warnings for Win32 build

The Win32 build warns about trace/control-internal.h:

warning: 'trace_event_count' declared inline after being called

Fix this by simply reordering trace_event_id() and
trace_event_count().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

trace/control-internal.h

diff --git a/trace/control-internal.h b/trace/control-internal.h
index cce2da4..b3f587e 100644
--- a/trace/control-internal.h
+++ b/trace/control-internal.h
@@ -16,17 +16,17 @@
 extern TraceEvent trace_events[];
 
 
+static inline TraceEventID trace_event_count(void)
+{
+    return TRACE_EVENT_COUNT;
+}
+
 static inline TraceEvent *trace_event_id(TraceEventID id)
 {
     assert(id < trace_event_count());
     return &trace_events[id];
 }
 
-static inline TraceEventID trace_event_count(void)
-{
-    return TRACE_EVENT_COUNT;
-}
-
 static inline bool trace_event_is_pattern(const char *str)
 {
     assert(str != NULL);