fsck: remove unnecessary raises

The called functions already raise RetryFsck.

nilmdb/fsck/fsck.py

@@ -287,7 +287,7 @@ class Fsck(object):
             files = list(filter(regex.search, os.listdir(subpath)))
             if not files:
                 self.fix_empty_subdir(subpath)
-                raise RetryFsck  # pragma: no cover; raised by fix_empty_subdir
+
             # Verify that their size is a multiple of the row size
             for filename in files:
                 filepath = os.path.join(subpath, filename)
@@ -364,7 +364,7 @@ class Fsck(object):
                 erow = tab[epos-1]  # noqa: F841 unused
             except Exception as e:
                 self.fix_bad_interval(sid, intv, tab, str(e))
-                raise RetryFsck  # pragma: no cover; raised by fix_bad_interval
+
         return len(ints)
 
     def fix_bad_interval(self, sid, intv, tab, msg):