ext4/304: ignore EINVAL and ENODATA error

ext4/304: ignore EINVAL and ENODATA error

ext4/304 is also ext4 defragmentation stress test, which creates several
threads to perform defragmentation using 'inplace' mode, but there is a
possible race that the donor file has been truncated by thread_A, while
thread_B starts to call ioctl(EXT4_IOC_MOVE_EXT), then we may get a
EINVAL or ENODATA error.

Please see: http://www.spinics.net/lists/linux-ext4/msg46900.html for
detailed information.

Signed-off-by: Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>