tcp dissector doesn't decode TCP segments of length 1

This issue was migrated from bug 4716 in our old bug tracker.

Original bug information:

Reporter: ala…@‍as2…
Status: RESOLVED FIXED
Product: Wireshark
Component: TShark
OS: Windows XP
Platform: x86
Version: 1.2.6

Attachments:

data.pcap: data.pcap is a pcap that demonstrates the bug.
bug4716_1.patch: Initialize analysis windows to G_MAXUINT32 instead of 0. Display zero window probe data.

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