[rtmpdump] Unrecognized option

[Anders Hasselqvist]

Hi Howard,

Occasionally I have to resume a download that has failed.
In those cases I just append "--resume" to the command line.
On several occasions I have been a bit fast and only typed "-resume"
or misspelled it in some other way.
Instead of getting an error stating I provided an unknown option, my
file is just overwritten.

I think that from a user perspective it would be better that rtmpdump
(and friends) abort when an unknown option is provided.

Regards,
Anders