*: convert amenable fdopendir() calls to take_fdopendir()

Some fdopendir() calls remain where safe_close() is manually
performed, those could be simplified as well by converting to
use the _cleanup_close_ machinery, but makes things less trivial
to review so left for a future cleanup.

src/basic/copy.c

@@ -15,6 +15,7 @@
 #include "copy.h"
 #include "dirent-util.h"
 #include "fd-util.h"
+#include "fileio.h"
 #include "fs-util.h"
 #include "io-util.h"
 #include "macro.h"
@@ -569,10 +570,9 @@ static int fd_copy_directory(
         if (fdf < 0)
                 return -errno;
 
-        d = fdopendir(fdf);
+        d = take_fdopendir(&fdf);
         if (!d)
                 return -errno;
-        fdf = -1;
 
         exists = false;
         if (copy_flags & COPY_MERGE_EMPTY) {

src/basic/stat-util.c

@@ -10,6 +10,7 @@
 #include "alloc-util.h"
 #include "dirent-util.h"
 #include "fd-util.h"
+#include "fileio.h"
 #include "fs-util.h"
 #include "macro.h"
 #include "missing_fs.h"
@@ -77,10 +78,9 @@ int dir_is_empty_at(int dir_fd, const char *path) {
         if (fd < 0)
                 return -errno;
 
-        d = fdopendir(fd);
+        d = take_fdopendir(&fd);
         if (!d)
                 return -errno;
-        fd = -1;
 
         FOREACH_DIRENT(de, d, return -errno)
                 return 0;