pylint fixes

spynnaker/pyNN/utilities/neo_buffer_database.py

@@ -329,7 +329,7 @@ def has_population_metadata(self, pop_label: str) -> bool:
                 Typically the Population label, corrected for `None` or
                 duplicate values
         """
-        for row in self.cursor().execute(
+        for _ in self.cursor().execute(
                 """
                 SELECT pop_size
                 FROM population