libceph: don't bail early from try_read() when skipping a message

libceph: don't bail early from try_read() when skipping a message

The contract between try_read() and try_write() is that when called
each processes as much data as possible.  When instructed by osd_client
to skip a message, try_read() is violating this contract by returning
after receiving and discarding a single message instead of checking for
more.  try_write() then gets a chance to write out more requests,
generating more replies/skips for try_read() to handle, forcing the
messenger into a starvation loop.

Cc: [email protected] # 3.10+
Reported-by: Varada Kari <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>
Tested-by: Varada Kari <[email protected]>
Reviewed-by: Alex Elder <[email protected]>