decoder could read 1 byte beyond data of section 4

[vsouvan]

When an invalid BUFR message with a short data section 4. The decoder may read 1 byte beyond data of section4 in memory.
This could result in false value for the last descriptor if section 4 is short by 1 byte only.

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Imported from Launchpad using lp2gh.

• date created: 2014-03-18T19:45:45Z
• owner: vanh-souvanlasy
• assignee: vanh-souvanlasy
• the launchpad url was https://bugs.launchpad.net/bugs/1294321

[vsouvan]

(by vanh-souvanlasy)
substracted 1 from test condition before allowing use of next byte.