[Cbc] Using SOS1 getting malloc: pointer being freed was not allocated

[Rhavar]

Example:

https://gist.github.com/RHavar/58d232e8d353fabd9a5cd1060cf996a6

Reproduce with  `cbc problem.lp solve`

Running with:

Welcome to the CBC MILP Solver

Version: 2.9.6

Build Date: Dec 22 2017

ends up with:

cbc(19780,0x7fffb8236340) malloc: *** error for object 0x7fb692934e40: pointer being freed was not allocated

*** set a breakpoint in malloc_error_break to debug

Abort trap: 6

-Ryan
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