bnx2: Use const on flash_table structure.

The structure, once initialized, never changes.

Signed-off-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index 3c004b44..7544188 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -6889,7 +6889,7 @@
 	int			pm_cap;
 	int			pcix_cap;
 
-	struct flash_spec	*flash_info;
+	const struct flash_spec	*flash_info;
 	u32			flash_size;
 
 	int			status_stats_size;