[PATCHv2] ftrace/samples: Add missing prototype for my_direct_func

[Jiri Olsa <jolsa@redhat.com>]

There's compilation fail reported kernel test robot for W=1 build:

  >> samples/ftrace/ftrace-direct-multi.c:8:6: warning: no previous
  prototype for function 'my_direct_func' [-Wmissing-prototypes]
     void my_direct_func(unsigned long ip)

The inlined assembly is used outside function, so we can't make
my_direct_func static and pass it as asm input argument.

However my_tramp is already extern so I think there's no problem
keeping my_direct_func extern as well and just add its prototype.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 5fae941b9a6f ("ftrace/samples: Add multi direct interface test module")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 samples/ftrace/ftrace-direct-multi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c
index 2a5b1fb7ac14..b6d7806b400e 100644
--- a/samples/ftrace/ftrace-direct-multi.c
+++ b/samples/ftrace/ftrace-direct-multi.c
@@ -5,6 +5,8 @@
 #include <linux/ftrace.h>
 #include <linux/sched/stat.h>
 
+extern void my_direct_func(unsigned long ip);
+
 void my_direct_func(unsigned long ip)
 {
 	trace_printk("ip %lx\n", ip);
-- 
2.32.0