lxd/storage_volumes: Fix format string (govet)

Signed-off-by: Julian Pelizäus <[email protected]>

lxd/storage_volumes.go

@@ -2691,7 +2691,7 @@ func addStoragePoolVolumeDetailsToRequestContext(s *state.State, r *http.Request
 	// Convert the volume type name to our internal integer representation.
 	volumeType, err := storagePools.VolumeTypeNameToDBType(volumeTypeName)
 	if err != nil {
-		return api.StatusErrorf(http.StatusBadRequest, err.Error())
+		return api.StatusErrorf(http.StatusBadRequest, "%s", err.Error())
 	}
 
 	details.volumeType = volumeType