xen-blkfront.c: make blkif_ioctl() static

This patch makes the needlessly global blkif_ioctl() static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

drivers/block/xen-blkfront.c

@@ -154,7 +154,7 @@ static int blkif_getgeo(struct block_device *bd, struct hd_geometry *hg)
 	return 0;
 }
 
-int blkif_ioctl(struct inode *inode, struct file *filep,
+static int blkif_ioctl(struct inode *inode, struct file *filep,
 		       unsigned command, unsigned long argument)
 {
 	struct blkfront_info *info =