buffer overrun in options test

[mlite]

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NNG & Platform details.

the code pulled from HEAD:master

Expected Behavior

options test passes

Actual Behavior

options test fails with buffer overrun

The runtime error with backtrace:
DTS_MSG: Stensal C/C++ DTS detected a fatal program error!
DTS_MSG: Continuing the execution will cause unexpected behaviors, abort!
DTS_MSG: Reading 4 bytes at 0xff8a8160 will read undefined values.
DTS_MSG: Diagnostic information:

• The object to-be-read (start:0xff8a815c, size:4 bytes) is allocated at

• file:/home/sbuilder/workspace/nng/tests/options.c::29, 1
  

• 0xff8a815c 0xff8a815f
• +------------------------+
• | the object to-be-read |......
• +------------------------+

•                        ^~~~~~~~~~
  

•    the read starts at 0xff8a8160 that is right after the object end.
  

• Stack trace (most recent call first):
  -[1] file:/home/sbuilder/workspace/nng/src/supplemental/util/options.c::26, 2
  -[2] file:/home/sbuilder/workspace/nng/tests/options.c::29, 1
  -[3] file:/home/sbuilder/workspace/nng/tests/convey.c::1039, 6
  -[4] file:/home/sbuilder/workspace/nng/tests/options.c::29, 1

Steps to Reproduce

options -v -p TEST_PORT 13340

[gdamore]

Yep, we do walk off the end of the args array... oops.