Removed unused custom __del__ methods to prevent memory leaks

src/binwalk/core/module.py

@@ -245,9 +245,6 @@ class Module(object):
         except AttributeError as e:
             pass
 
-    def __del__(self):
-        return None
-
     def __enter__(self):
         return self
 

src/binwalk/core/plugin.py

@@ -108,9 +108,6 @@ class Plugins(object):
         self.parent = parent
         self.settings = binwalk.core.settings.Settings()
 
-    def __del__(self):
-        pass
-
     def __enter__(self):
         return self
 

src/binwalk/modules/general.py

@@ -124,20 +124,6 @@ class General(Module):
 
     def reset(self):
         pass
-        #for fp in self.target_files:
-        #    fp.reset()
-
-    def __del__(self):
-        self._cleanup()
-
-    def __exit__(self, a, b, c):
-        self._cleanup()
-
-    def _cleanup(self):
-        pass
-        #if hasattr(self, 'target_files'):
-        #    for fp in self.target_files:
-        #        fp.close()
 
     def _set_verbosity(self):
         '''