Correct the definition of AX_RXHDR_CRC_ERR and AX_RXHDR_DROP_ERR. They a...

...re BIT29 and BIT31 in pkt_hdr seperately.

https://lkml.org/lkml/2013/10/22/32

Fix for issue #5, commit msg taken from your LKML submission in the URL given. This repo is still necessary for those running kernels older than 3.12 (most distros, currently) so it is still important.