selftests: net: fix array_size.cocci warning

Fix array_size.cocci warning in tools/testing/selftests/net.

Use `ARRAY_SIZE(arr)` instead of forms like `sizeof(arr)/sizeof(arr[0])`.

It has been tested with gcc (Debian 8.3.0-6) 8.3.0.

Signed-off-by: Guo Zhengkui <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Paolo Abeni <[e-mail]>

tools/testing/selftests/net/cmsg_sender.c

···
 #include <linux/udp.h>
 #include <sys/socket.h>
 
+#include "../kselftest.h"
+
 enum {
 	ERN_SUCCESS = 0,
 	/* Well defined errors, callers may depend on these */
···
 		[SCM_TSTAMP_ACK]	= "ACK",
 	};
 
-	if (info < sizeof(names) / sizeof(names[0]))
+	if (info < ARRAY_SIZE(names))
 		return names[info];
 	return "unknown";
 }

tools/testing/selftests/net/psock_fanout.c

···
 #include <unistd.h>
 
 #include "psock_lib.h"
+#include "../kselftest.h"
 
 #define RING_NUM_FRAMES			20
 
···
 	struct sock_fprog bpf_prog;
 
 	bpf_prog.filter = bpf_filter;
-	bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
+	bpf_prog.len = ARRAY_SIZE(bpf_filter);
 
 	if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &bpf_prog,
 		       sizeof(bpf_prog))) {
···
 	memset(&attr, 0, sizeof(attr));
 	attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
 	attr.insns = (unsigned long) prog;
-	attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
+	attr.insn_cnt = ARRAY_SIZE(prog);
 	attr.license = (unsigned long) "GPL";
 	attr.log_buf = (unsigned long) log_buf,
 	attr.log_size = sizeof(log_buf),

tools/testing/selftests/net/toeplitz.c

···
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "../kselftest.h"
+
 #define TOEPLITZ_KEY_MIN_LEN	40
 #define TOEPLITZ_KEY_MAX_LEN	60
 
···
 	struct sock_fprog prog = {};
 
 	prog.filter = filter;
-	prog.len = sizeof(filter) / sizeof(struct sock_filter);
+	prog.len = ARRAY_SIZE(filter);
 	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &prog, sizeof(prog)))
 		error(1, errno, "setsockopt filter");
 }
···
 	struct sock_fprog prog = {};
 
 	prog.filter = filter;
-	prog.len = sizeof(filter) / sizeof(struct sock_filter);
+	prog.len = ARRAY_SIZE(filter);
 	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &prog, sizeof(prog)))
 		error(1, errno, "setsockopt filter");
 }