IB/iser: Delete an unnecessary variable initialisation in iser_send_data_out()

The variable "tx_desc" will be set to an appropriate pointer a bit later.
Thus omit the explicit initialisation at the beginning.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/ulp/iser/iser_initiator.c

@@ -436,7 +436,7 @@ int iser_send_data_out(struct iscsi_conn *conn,
 {
 	struct iser_conn *iser_conn = conn->dd_data;
 	struct iscsi_iser_task *iser_task = task->dd_data;
-	struct iser_tx_desc *tx_desc = NULL;
+	struct iser_tx_desc *tx_desc;
 	struct iser_mem_reg *mem_reg;
 	unsigned long buf_offset;
 	unsigned long data_seg_len;