The dn variable in lpc_low_level_output() was originally defined as a
u32_t but it is later compared to the s32_t return value from
lpc_tx_ready(). Since it is intialized to pbuf_clean() which returns
a u8_t, a s32_t type can safely hold the initial value and remains
consistent with the signed lpc_tx_ready() comparison.
I also modifed writtenLen in TCPSocketConnection::send_all() and
readLen in TCPSocketConnection::recieve_all() to be of type int instead
of size_t. This is more consistent with their usage within these
methods (they accumulate int ret values and are compared to the int
length value) and their use as a signed integer return values.
Bogdan Marinescu
Adam Green
Emilio Monti