Layers: Close file on layer destruction to prevent ResourceWarning

Author: ikelos

volatility3/framework/layers/physical.py

@@ -189,6 +189,9 @@ def destroy(self) -> None:
         """Closes the file handle."""
         self._file.close()
 
+    def __del__(self) -> None:
+        self.destroy()
+
     @classmethod
     def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:
         return [requirements.StringRequirement(name = 'location', optional = False)]