f Err nit

Author: tnull

lightning/src/util/test_utils.rs

@@ -457,7 +457,7 @@ impl KVStore for TestStore {
 		if self.read_only {
 			return Err(io::Error::new(
 				io::ErrorKind::PermissionDenied,
-				"read only",
+				"Cannot modify read-only store",
 			));
 		}
 		let mut persisted_lock = self.persisted_bytes.lock().unwrap();
@@ -472,7 +472,7 @@ impl KVStore for TestStore {
 		if self.read_only {
 			return Err(io::Error::new(
 				io::ErrorKind::PermissionDenied,
-				"read only",
+				"Cannot modify read-only store",
 			));
 		}