CLEANUP: peers: Remove useless statements.

CLEANUP: peers: Remove useless statements.

When implementing peer_recv_msg() we added the statements reached with
a "goto imcomplete" at the end of this function. This statements
are executed only when co_getblk() returns something <0. So they
are useless for now on, and may be safely removed. The following
section wich was responsible of sending any peer protocol messages
were reached only when co_getblk() returned 0 (no more message to
read). In this case we replace the "goto impcomplete" statement by
a "goto send_msgs" to reach this only when peer_recv_msg() returns 0.

May be backported as far as 1.5.