These should have been part of 15767 too.
diff --git a/coreutils/du.c b/coreutils/du.c
index b204a02..29427c7 100644
--- a/coreutils/du.c
+++ b/coreutils/du.c
@@ -121,7 +121,7 @@
 		struct dirent *entry;
 		char *newfile;
 
-		dir = bb_opendir(filename);
+		dir = warn_opendir(filename);
 		if (!dir) {
 			status = EXIT_FAILURE;
 			return sum;