rds: Fix inaccurate accounting of unsignaled wrs in rds_ib_xmit_rdma

rds: Fix inaccurate accounting of unsignaled wrs in rds_ib_xmit_rdma

The number of unsignaled work-requests posted to the IB send queue is
tracked by a counter in the rds_ib_connection struct. When it reaches
zero, or the caller explicitly asks for it, the send-signaled bit is
set in send_flags and the counter is reset. This is performed by the
rds_ib_set_wr_signal_state() function.

However, this function is not used in rds_ib_xmit_rdma(), which yields
inaccurate accounting. This commit fixes this.

Orabug: 27090772

Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Knut Omang <knut.omang@oracle.com>
Reviewed-by: Wei Lin Guay <wei.lin.guay@oracle.com>
Reviewed-by: Avinash Repaka <avinash.repaka@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>