Fix code in aws_is_mem_zeroed of AWS-C-Common
Fixes #1042 (closed). The original code contains a strict-aliasing violation. This removes the violating code and leaves only the loop that iterates char-wise over the buffer (which is allowed).
Fixes #1042 (closed). The original code contains a strict-aliasing violation. This removes the violating code and leaves only the loop that iterates char-wise over the buffer (which is allowed).