Merge pull request #26 from ruby/fix-connection-leak-with-non-standar…

…d-errors

Fix connection leak when non-StandardError exceptions raise

lib/net/ftp.rb

@@ -577,7 +577,7 @@ def transfercmd(cmd, rest_offset = nil) # :nodoc:
           if !resp.start_with?("1")
             raise FTPReplyError, resp
           end
-        rescue
+        rescue Exception
           conn&.close
           raise
         end