delete unused variable

examples/vfsreadlat.c

@@ -41,7 +41,7 @@ static unsigned int log2l(unsigned long v)
 int do_entry(struct pt_regs *ctx)
 {
 	u32 pid;
-	u64 ts, *val, zero = 0;
+	u64 ts, *val;
 
 	pid = bpf_get_current_pid_tgid();
 	ts = bpf_ktime_get_ns();