rados: naming conventions: disable revive naming check on old struct

This struct has public fields that violate standard naming
conventions.
Disable the check on this struct only.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

rados/ioctx.go

@@ -45,6 +45,8 @@ const (
 	CreateIdempotent = C.LIBRADOS_CREATE_IDEMPOTENT
 )
 
+//revive:disable:var-naming old-yet-exported public api
+
 // PoolStat represents Ceph pool statistics.
 type PoolStat struct {
 	// space used in bytes
@@ -69,6 +71,8 @@ type PoolStat struct {
 	Num_wr_kb            uint64
 }
 
+//revive:enable:var-naming
+
 // ObjectStat represents an object stat information
 type ObjectStat struct {
 	// current length in bytes