firewire: remove unused struct member

request_generation is internal to fw-ohci and unneeded in fw_card.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index d5d8177..4f02c55 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -178,7 +178,7 @@
 	struct tasklet_struct bus_reset_tasklet;
 	int node_id;
 	int generation;
-	int request_generation;
+	int request_generation;	/* for timestamping incoming requests */
 	u32 bus_seconds;
 	bool old_uninorth;
 	bool bus_reset_packet_quirk;