BIO_s_mem() write: Skip early when input length is zero
When the input length is zero, just return zero early. Otherwise, there's a small chance that memory allocation is engaged, fails and returns -1, which is a bit confusing when nothing should be written. Fixes #4782 #4827 Reviewed-by:Ben Kaduk <kaduk@mit.edu> (Merged from https://github.com/openssl/openssl/pull/6175)
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