ibmraid: fix writeable attribute with no store method

https://bugzilla.kernel.org/show_bug.cgi?id=81311

[ 0.603157] WARNING: at drivers/base/core.c:601
device_create_file+0x8d/0xa0()
[ 0.603158] Attribute adapter_id: write permission without 'store'
[ 0.603159] Modules linked in: i915(+) i2c_algo_bit drm_kms_helper drm
mpt2sas(+) pmcraid(+) raid_class scsi_transport_sas i2c_core video

Signed-off-by: Alan Cox <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/scsi/pmcraid.c

···
 static struct device_attribute pmcraid_adapter_id_attr = {
 	.attr = {
 		 .name = "adapter_id",
-		 .mode = S_IRUGO | S_IWUSR,
+		 .mode = S_IRUGO,
 		 },
 	.show = pmcraid_show_adapter_id,
 };