- Fix usage of setmode. it can fail due to malloc, so we should print the
  correct error message.

Obtained-from: DragonFlyBSD
Index: src/bin/mkdir/mkdir.c
===================================================================
--- src/bin/mkdir/mkdir.c	(revision 103)
+++ src/bin/mkdir/mkdir.c	(revision 104)
@@ -91,8 +91,13 @@
 	if (mode == NULL) {
 		omode = S_IRWXU | S_IRWXG | S_IRWXO;
 	} else {
-		if ((set = setmode(mode)) == NULL)
-			errx(1, "invalid file mode: %s", mode);
+		errno = 0;
+		if ((set = setmode(mode)) == NULL) {
+			if (!errno)
+				errx(1, "invalid file mode: %s", mode);
+			else
+				err(1, "setmode");
+		}
 		omode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO);
 		free(set);
 	}