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/[e-mail]
Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
Acked-by: Saurav Kashyap <[e-mail]>
Signed-off-by: Jiasheng Jiang <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/qedf/qedf_main.c

···
 	 */
 	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);