storage_backend_rbd: Drop ATTRIBUTE_UNUSED for arguments that are used

In two places the passed pool object argument is marked as
ATTRIBUTE_UNUSED even though it's used right away.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/storage/storage_backend_rbd.c

@@ -1063,7 +1063,7 @@ virStorageBackendRBDBuildVolFrom(virStoragePoolObjPtr pool,
 }
 
 static int
-virStorageBackendRBDRefreshVol(virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
+virStorageBackendRBDRefreshVol(virStoragePoolObjPtr pool,
                                virStorageVolDefPtr vol)
 {
     virStorageBackendRBDStatePtr ptr = NULL;
@@ -1083,7 +1083,7 @@ virStorageBackendRBDRefreshVol(virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
 }
 
 static int
-virStorageBackendRBDResizeVol(virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
+virStorageBackendRBDResizeVol(virStoragePoolObjPtr pool,
                               virStorageVolDefPtr vol,
                               unsigned long long capacity,
                               unsigned int flags)