Python cleanup

tools/donate-cpu-server.py

@@ -144,7 +144,7 @@ if __name__ == "__main__":
         connection, client_address = sock.accept()
         try:
             cmd = connection.recv(128)
-        except socket.error as e:
+        except socket.error:
             continue
         if cmd.find('\n') < 1:
             continue

tools/donate-cpu.py

@@ -150,7 +150,7 @@ def uploadResults(package, results):
     try:
         sendAll(sock, 'write\n' + package + '\n' + results + '\nDONE')
         sock.close()
-    except socket.error as e:
+    except socket.error:
         pass
     return package