Teach pwd to detect write errors.
diff --git a/toys/pwd.c b/toys/pwd.c
index 3ba7ae0..59d7223 100644
--- a/toys/pwd.c
+++ b/toys/pwd.c
@@ -9,7 +9,7 @@
 {
 	char *pwd = xgetcwd();
 
-	puts(pwd);
+	xprintf("%s\n", pwd);
 	if (CFG_TOYS_FREE) free(pwd);
 
 	return 0;