staging/rdma/hfi1: Remove incorrect link credit check

Remove an invalid sanity check that compares the local link
credits with the peer link credits.  The two have no dependency
on each other.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>