tracing: Remove obsolete macro guard _TRACE_PROFILE_INIT

The macro _TRACE_PROFILE_INIT was removed a long time ago,
but an "#undef" guard was left behind. Remove it.

Link: http://lkml.kernel.org/r/514684EE.6000805@huawei.comSigned-off-by: Nzhangwei(Jovi) <jovi.zhangwei@huawei.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>

include/trace/ftrace.h

@@ -704,5 +704,3 @@ static inline void perf_test_probe_##call(void)				\
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 #endif /* CONFIG_PERF_EVENTS */
 
-#undef _TRACE_PROFILE_INIT
-