Revert "Fix showing directories when -R flag is set in ls(1)"

This reverts commit bb83eade39.

This commit causes the loop through dents at the end of main to
continue past the end of the dents array, causing a crash when
called with multiple directory arguments.

ls.c

@@ -278,7 +278,7 @@ lsdir(const char *path, const struct entry *dir)
 	if (!Uflag)
 		qsort(ents, n, sizeof(*ents), entcmp);
 
-	if (ds++)
+	if (ds > 1 && (path[0] || dir->name[0] != '.'))
 		printf("%s:\n", dir->name);
 	for (i = 0; i < n; i++)
 		output(&ents[i]);