IB/rxe: Initialize ib_ah_attr during query_ah

Zero out ib_ah_attr before calling query_ah. Set ah_flags
appropriately.

Reviewed-by: Ira Weiny <[e-mail]>
Reviewed-by: Don Hiatt <[e-mail]>
Reviewed-by: Sean Hefty <[e-mail]>
Signed-off-by: Dasaratharaman Chandramouli <[e-mail]>
Signed-off-by: Doug Ledford <[e-mail]>

drivers/infiniband/sw/rxe/rxe_av.c

···
 		   struct ib_ah_attr *attr)
 {
 	memcpy(&attr->grh, &av->grh, sizeof(av->grh));
+	attr->ah_flags = IB_AH_GRH;
 	attr->port_num = av->port_num;
 	return 0;
 }

drivers/infiniband/sw/rxe/rxe_verbs.c

···
 	struct rxe_dev *rxe = to_rdev(ibah->device);
 	struct rxe_ah *ah = to_rah(ibah);
 
+	memset(attr, 0, sizeof(*attr));
 	rxe_av_to_attr(rxe, &ah->av, attr);
 	return 0;
 }