correct duplicated enum name

[cychong47]

Enum name nfapi_ack_nack_mode_e is used twice. Correct the second enum with the proper name

[olivbull]

Thanks for the fix, but is there any chance you can make the change so that only the one corrected line is shown in the diff? Then we can merge in trivially.

[cychong47]

Seems that this is due to the file encoding problem.
I edit the file on github.com directly and it said

We’ve detected the file encoding as windows-1252. When you commit changes we will transcode it to UTF-8.

[cychong47]

I send another PR(#21) for this fix. Close this one