drivers/infiniband/core/verbs.c: fix build with gcc-4.4.4

gcc-4.4.4 has issues with initialization of anonymous unions.

drivers/infiniband/core/verbs.c: In function '__ib_drain_sq':
drivers/infiniband/core/verbs.c:2204: error: unknown field 'wr_cqe' specified in initializer
drivers/infiniband/core/verbs.c:2204: warning: initialization makes integer from pointer without a cast

Work around this.

Fixes: a1ae7d03 ("RDMA/core: Avoid that ib_drain_qp() triggers an out-of-bounds stack access")
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Steve Wise <swise@opengridcomputing.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/verbs.c

@@ -2196,8 +2196,9 @@ static void __ib_drain_sq(struct ib_qp *qp)
 	struct ib_send_wr *bad_swr;
 	struct ib_rdma_wr swr = {
 		.wr = {
+			.next = NULL,
+			{ .wr_cqe	= &sdrain.cqe, },
 			.opcode	= IB_WR_RDMA_WRITE,
-			.wr_cqe	= &sdrain.cqe,
 		},
 	};
 	int ret;