st: convert DRIVER_ATTR macros to DRIVER_ATTR_RO
Convert DRIVER_ATTR macros to DRIVER_ATTR_RO requested by Greg KH. Also switched to using scnprintf instead of snprintf per Documentation/filesystems/sysfs.txt. Suggested-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NShane Seymour <shane.seymour@hp.com> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: NKai Mäkisara <kai.makisara@kolumbus.fi> Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
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