[ECOS] bug in sprintf

[Andrew Lunn]

> Indeed.  More importantly, it's curious why the 'size_t' branch of
> that conditional is even being executed for simple signed values.

I don't think it is. Looking at the asm, it looks like the size_t code
has invoked a bug in the optimizer which caused it to get the signed
branch of the condition wrong. 

       Andrew

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