This is just a small patch to fix some compiler warnings I found in my own contributed code, lib/curl_darwinssl.c. After reading all of this recent talk about building with alternate compilers, I tried building the trunk with LLVM Clang instead of the default llvm-gcc, and it caught a few things that llvm-gcc didn't notice. Please consider this patch for the next point release. Thanks.

Nick Zitzmann
<http://www.chronosnet.com/>

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