in_forward: increase the buffer size to buffer_max_size
in_forward: increase the buffer size to buffer_max_size

 If conn->buf_size is no space to add buffer_chunk_size,
 the size to realloc should be buffer_max_size.

Signed-off-by: Takahiro Yamashita <8b9f03f78cb27351a99f79113f99e589b65190d5@gmail.com>

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