ext4: add FITRIM to compat_ioctl.

FITRIM isn't added in compat_ioctl. So a 32 bit program can't be executed
in a 64 bit platform. Add it in the compat_ioctl.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index c052c9f..bb424de 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -427,6 +427,7 @@
 		return err;
 	}
 	case EXT4_IOC_MOVE_EXT:
+	case FITRIM:
 		break;
 	default:
 		return -ENOIOCTLCMD;