Remove debug print which printed xd->refcnt without rec
lock.

This was slightly unsafe, and a trap was found here by
"Rong Zeng" <rongzeng@us.ibm.com>.

Signed-off-by: Matt Benjamin <matt@linuxbox.com>
Fix return of rpc_dplx_rec locked.

Various invariants rely on this.  Underlying races caused by
this bug found by "Rong Zeng" <rongzeng@us.ibm.com>.

Signed-off-by: Matt Benjamin <matt@linuxbox.com>