don't generate the checksum on failure

Author: TingDaoK

source/s3_checksum_stream.c

@@ -111,10 +111,6 @@ static void s_aws_input_checksum_stream_destroy(struct aws_checksum_stream *impl
     if (!impl) {
         return;
     }
-
-    /* Compute the checksum of whatever was read, if we didn't reach the end of the underlying stream. */
-    s_finalize_checksum(impl);
-
     aws_checksum_destroy(impl->checksum);
     aws_input_stream_release(impl->old_stream);
     aws_byte_buf_clean_up(&impl->checksum_result);