Update smbclient.py (#1933)

Fix error in self.outputfile access

Author: daddycocoaman

impacket/examples/smbclient.py

@@ -614,7 +614,7 @@ def do_cat(self, filename):
             finally:
                 fh.close()
         else:
-            if self.outpufile:
+            if self.outputfile:
                 f.write(error_msg + '\n')
                 f.close()
             print(error_msg)