RDMA/nes: Fix tmp_addr compilation warning

In find_node(), tmp_addr causes an "unused variable" warning when
INFINIBAND_NES_DEBUG is not defined.  It's only used in a nes_debug()
and the print does not make sense.  So take out the whole thing.

Reported-by: Manish Katiyar <mkatiyar@gmail.com>
Signed-off-by: Chien Tung <chien.tin.tung@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>