Print first-pass read errors at the end.

That way, they don't, for example, get lost as a result of being
scrolled off the screen by output from the second pass.

Also, do the post-processing of output regardless of whether we got read
errors or not, and fix a code error hidden by a call to tshark_debug().

Change-Id: I389c7c794f4dd5fda6e4c50ce480802c92701866
Reviewed-on: https://code.wireshark.org/review/21305
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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