[scan-build] Fix reported unix api bugs

[Apelete Seketeli via llvm-commits]

Hello,

Here are a few changes that try to address some logic error bugs
reported by running scan-build over the Compiler-RT code base.

I have no background in compiler technology and I may have been trying
to fix false positives; here is a quick overview of what scan-build
reported, let me know if the fixes are relevant:

Bug Group: Unix API
Bug Type: Allocator sizeof operand mismatch
Files: lib/builtins/emutls.c

Cheers.
-- 
        Apelete
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