Incorrect io-stat table format when unsupported "-t" operand is specified and when using AVG of relative_time fields

This issue was migrated from bug 7685 in our old bug tracker.

Original bug information:

Reporter: Cal Turney
Status: RESOLVED FIXED
Product: Wireshark
Component: TShark
OS: Windows 7
Platform: x86
Version: 1.9.x (Experimental)

Attachments:

Before-and-after-patch.txt: tshark output before and after the patch is applied
tap-iostat.c.patch: Patch for both problems