lpfc: fix memory leak and NULL dereference

kmalloc() can return NULL and without checking we were dereferencing it.
Moreover if kmalloc succeeds but the function fails in other parts then
we were returning the error code but we missed freeing lcb_context.
While at it fixed one related checkpatch warning.
Signed-off-by: NSudip Mukherjee <sudip@vectorindia.org>
Reviewed-by: NJames Smart <james.smart@avagotech.com>
Signed-off-by: NJames Bottomley <JBottomley@Odin.com>

drivers/scsi/lpfc/lpfc_els.c

@@ -5173,7 +5173,6 @@ lpfc_els_rcv_lcb(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
 		rjt_err = LSRJT_CMD_UNSUPPORTED;
 		goto rjt;
 	}
-	lcb_context = kmalloc(sizeof(struct lpfc_lcb_context), GFP_KERNEL);
 
 	if (phba->hba_flag & HBA_FCOE_MODE) {
 		rjt_err = LSRJT_CMD_UNSUPPORTED;
@@ -5204,6 +5203,12 @@ lpfc_els_rcv_lcb(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
 		goto rjt;
 	}
 
+	lcb_context = kmalloc(sizeof(*lcb_context), GFP_KERNEL);
+	if (!lcb_context) {
+		rjt_err = LSRJT_UNABLE_TPC;
+		goto rjt;
+	}
+
 	state = (beacon->lcb_sub_command == LPFC_LCB_ON) ? 1 : 0;
 	lcb_context->sub_command = beacon->lcb_sub_command;
 	lcb_context->type = beacon->lcb_type;
@@ -5214,6 +5219,7 @@ lpfc_els_rcv_lcb(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
 	if (lpfc_sli4_set_beacon(vport, lcb_context, state)) {
 		lpfc_printf_vlog(ndlp->vport, KERN_ERR,
 				 LOG_ELS, "0193 failed to send mail box");
+		kfree(lcb_context);
 		lpfc_nlp_put(ndlp);
 		rjt_err = LSRJT_UNABLE_TPC;
 		goto rjt;