scsi: qedf: Fix potential dereference of NULL pointer

The return value of dma_alloc_coherent() needs to be checked to avoid use
of NULL pointer in case of an allocation failure.

Link: https://lore.kernel.org/r/20211216101449.375953-1-jiasheng@iscas.ac.cn
Fixes: 61d8658b ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
Acked-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qedf/qedf_main.c

@@ -1415,6 +1415,8 @@ static void qedf_upload_connection(struct qedf_ctx *qedf,
 	 */
 	term_params = dma_alloc_coherent(&qedf->pdev->dev, QEDF_TERM_BUFF_SIZE,
 		&term_params_dma, GFP_KERNEL);
+	if (!term_params)
+		return;
 
 	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_CONN, "Uploading connection "
 		   "port_id=%06x.\n", fcport->rdata->ids.port_id);