ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/ns87415.c b/drivers/ide/pci/ns87415.c
index f80be32..d4df464 100644
--- a/drivers/ide/pci/ns87415.c
+++ b/drivers/ide/pci/ns87415.c
@@ -260,7 +260,7 @@
 	hwif->ide_dma_end = &ns87415_ide_dma_end;
 }
 
-static struct ide_port_info ns87415_chipset __devinitdata = {
+static const struct ide_port_info ns87415_chipset __devinitdata = {
 	.name		= "NS87415",
 #ifdef CONFIG_SUPERIO
 	.init_iops	= init_iops_ns87415,