tracing/syscalls: Make syscall events print callbacks static

enter_syscall_print_##sname and exit_syscall_print_##sname don't
need to have a global scope. Make them static.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <1259734990-9034-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/syscalls.h

@@ -134,7 +134,7 @@ struct perf_event_attr;
 #define SYSCALL_TRACE_ENTER_EVENT(sname)				\
 	static const struct syscall_metadata __syscall_meta_##sname;	\
 	static struct ftrace_event_call event_enter_##sname;		\
-	struct trace_event enter_syscall_print_##sname = {		\
+	static struct trace_event enter_syscall_print_##sname = {	\
 		.trace                  = print_syscall_enter,		\
 	};								\
 	static struct ftrace_event_call __used				\
@@ -156,7 +156,7 @@ struct perf_event_attr;
 #define SYSCALL_TRACE_EXIT_EVENT(sname)					\
 	static const struct syscall_metadata __syscall_meta_##sname;	\
 	static struct ftrace_event_call event_exit_##sname;		\
-	struct trace_event exit_syscall_print_##sname = {		\
+	static struct trace_event exit_syscall_print_##sname = {	\
 		.trace                  = print_syscall_exit,		\
 	};								\
 	static struct ftrace_event_call __used				\