ext4: actually report that FITRIM is not supported

Change-Id: I75e0127135d9c6acb010b6b9e70163256aebe4eb
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 7ec8c67..d5cb2b8 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -433,9 +433,11 @@
 		if (copy_to_user((struct fstrim_range __user *)arg, &range,
 		    sizeof(range)))
 			return -EFAULT;
-#endif
 
 		return 0;
+#else
+		return -EOPNOTSUPP;
+#endif
 	}
 
 	default: