tree-wide: replace all readdir cycles with FOREACH_DIRENT{,_ALL} (#4853)

src/basic/util.c

@@ -18,7 +18,6 @@
 ***/
 
 #include <alloca.h>
-#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <sched.h>
@@ -508,28 +507,17 @@ void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
 int on_ac_power(void) {
         bool found_offline = false, found_online = false;
         _cleanup_closedir_ DIR *d = NULL;
+        struct dirent *de;
 
         d = opendir("/sys/class/power_supply");
         if (!d)
                 return errno == ENOENT ? true : -errno;
 
-        for (;;) {
-                struct dirent *de;
+        FOREACH_DIRENT(de, d, return -errno) {
                 _cleanup_close_ int fd = -1, device = -1;
                 char contents[6];
                 ssize_t n;
 
-                errno = 0;
-                de = readdir(d);
-                if (!de && errno > 0)
-                        return -errno;
-
-                if (!de)
-                        break;
-
-                if (hidden_or_backup_file(de->d_name))
-                        continue;
-
                 device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);
                 if (device < 0) {
                         if (errno == ENOENT || errno == ENOTDIR)