[PATCH] net: sample/bpf/tracex3_user.c: erase "ARRAY_SIZE" redefined

There is a warning when compiling bpf program in sample/bpf

BTW,i get the warning from David's net tree, then i git clone
bpf tree try to compile bpf program,but it tell me failed to
do that maybe i was not compile the whole kernel once.
I don't know this is ok or not.

Signed-off-by: Bo YU <redacted>
---
 samples/bpf/tracex3_user.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/samples/bpf/tracex3_user.c b/samples/bpf/tracex3_user.c
index 6c6b10f4c3ee..3d8c39b8ef24 100644
--- a/samples/bpf/tracex3_user.c
+++ b/samples/bpf/tracex3_user.c

@@ -17,7 +17,6 @@
 #include "bpf_load.h"
 #include "bpf_util.h"

-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))

 #define SLOTS 100