Use ARRAY_SIZE macro everywhere

This patch was generated by the following semantic patch (a trimmed down
version of what is shipped with Linux sources):

@@
type T;
T[] E;
@@
(
- (sizeof(E)/sizeof(*E))
+ ARRAY_SIZE(E)
|
- (sizeof(E)/sizeof(E[...]))
+ ARRAY_SIZE(E)
|
- (sizeof(E)/sizeof(T))
+ ARRAY_SIZE(E)
)

The only manual adjustment was to include utils.h in misc/nstat.c to make
the macro known there.

Signed-off-by: Phil Sutter <phil@nwl.cc>

bridge/link.c

@@ -319,7 +319,7 @@ static int brlink_modify(int argc, char **argv)
 		} else if (strcmp(*argv, "state") == 0) {
 			NEXT_ARG();
 			char *endptr;
-			size_t nstates = sizeof(port_states) / sizeof(*port_states);
+			size_t nstates = ARRAY_SIZE(port_states);
 
 			state = strtol(*argv, &endptr, 10);
 			if (!(**argv != '\0' && *endptr == '\0')) {

misc/nstat.c

@@ -30,6 +30,7 @@
 
 #include <json_writer.h>
 #include <SNAPSHOT.h>
+#include "utils.h"
 
 int dump_zeros;
 int reset_history;
@@ -95,7 +96,7 @@ static int useless_number(const char *id)
 {
 	int i;
 
-	for (i = 0; i < sizeof(useless_numbers)/sizeof(*useless_numbers); i++)
+	for (i = 0; i < ARRAY_SIZE(useless_numbers); i++)
 		if (strcmp(id, useless_numbers[i]) == 0)
 			return 1;
 	return 0;

misc/ss.c

@@ -666,7 +666,7 @@ static int get_slabstat(struct slabstat *s)
 	while (fgets(buf, sizeof(buf), fp) != NULL) {
 		int i;
 
-		for (i = 0; i < sizeof(slabstat_ids)/sizeof(slabstat_ids[0]); i++) {
+		for (i = 0; i < ARRAY_SIZE(slabstat_ids); i++) {
 			if (memcmp(buf, slabstat_ids[i], strlen(slabstat_ids[i])) == 0) {
 				sscanf(buf, "%*s%d", ((int *)s) + i);
 				cnt--;