scsi: qedf: Fix a possible memory leak in qedf_alloc_and_init_sb()

Hook "qed_ops->common->sb_init = qed_sb_init" does not release the DMA
memory sb_virt when it fails. Add dma_free_coherent() to free it. This
is the same way as qedr_alloc_mem_sb() and qede_alloc_mem_sb().

Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
Signed-off-by: Zhen Lei <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/qedf/qedf_main.c

···
 	    sb_id, QED_SB_TYPE_STORAGE);
 
 	if (ret) {
+		dma_free_coherent(&qedf->pdev->dev, sizeof(*sb_virt), sb_virt, sb_phys);
 		QEDF_ERR(&qedf->dbg_ctx,
 			 "Status block initialization failed (0x%x) for id = %d.\n",
 			 ret, sb_id);