s390/sclp: add const to bin_attribute structure

Declare bin_attribute structure as const as it is only passed as an
argument to the function sysfs_create_bin_file. This argument is of
type const, so declare the structure as const.

Cross compiled for s390 architecture.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/sclp_config.c

@@ -135,7 +135,7 @@ static ssize_t sysfs_ofb_data_write(struct file *filp, struct kobject *kobj,
 	return rc ?: count;
 }
 
-static struct bin_attribute ofb_bin_attr = {
+static const struct bin_attribute ofb_bin_attr = {
 	.attr = {
 		.name = "event_data",
 		.mode = S_IWUSR,