samples/bpf: Fix trailing semicolon

The trailing semicolon is an empty statement that does no operation. Removing it since it doesn't do anything.

---

Hi,

After fixing the same thing in drivers/staging/rtl8723bs/, Joe Perches suggested I fix it treewide [0].

Best regards
Luis

[0] http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2018-January/115410.html
[1] http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2018-January/115390.html

 samples/bpf/xdp_monitor_kern.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 2fe2f761a0d0..c969141bfa8b 100644
@@ -104,7 +104,7 @@ struct xdp_exception_ctx {
 SEC("tracepoint/xdp/xdp_exception")
 int trace_xdp_exception(struct xdp_exception_ctx *ctx)
 {
-	u64 *cnt;;
+	u64 *cnt;
 	u32 key;
 
 	key = ctx->act;

2.15.1

Applied to bpf-next, thanks Luis!