Reduce stack usage of _vfiprintf_r()

[Federico Terraneo]

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On 10/12/2012 11:22 PM, Freddie Chopin wrote:
> Hi!
> 
> How about the attached patch? I've tested and everything is fine.
> It's of course a modified version of patch from Corina, but with
> removed condition of size optimization.
> 
> Now each entry to _vfprintf_r() costs only about 190 bytes and 
> __sbprintf() allocates about 1150 (on ARM Cortex-M3).
> 
> 4\/3!!

Hope the patch gets accepted. At least imho it's the best compromise.
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