[Bug stdio/17829] Incorrect handling of precision specifier in printf family

[cherepan at mccme dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=17829

--- Comment #6 from Alexander Cherepanov <cherepan at mccme dot ru> ---
Created attachment 8862
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8862&action=edit
Fix computations for max precision in vfprintf

While the full fix requires some work allowing INT_MAX on 64-bit platforms
seems easy.

The computation of the amount of the required memory is done in size_t but the
check uses INT_MAX for some reason. Replacing it with SIZE_MAX looks like a
right thing.

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