sync: remove extraneous error checking
sync: remove extraneous error checking

These loops all end once a result of any sort is received for a child
process. It will already complete if every worked has a connection
error.

Signed-off-by: Josh Durgin <51652c783f70f5b272ebd02f1fd20d3af7a2449f@inktank.com>

ceph/radosgw-agent,ceph/radosgw-agent