[downloader]: Fix broken progress bar when content-length not provided (#8010)

* downloader: Fix broken progress bar

* Fix syntax error

* Fix variable scope

* Revert last changes

* Remove redundant space

lib/downloader.rb

@@ -125,32 +125,27 @@ def http_downloader(uri, filename = File.basename(url), verbose = false)
         warn "\n"
       end
 
+      progress_bar_thread = progress_bar.show # print progress bar
+
       # read file chunks from server, write it to filesystem
       File.open(filename, 'wb') do |io|
-        progress_bar_thread = progress_bar.show # print progress bar
-
         response.read_body do |chunk|
           downloaded_size += chunk.size # record downloaded size, used for showing progress bar
           progress_bar.set_downloaded_size(downloaded_size, invalid_size_error: false) if file_size.positive?
 
           io.write(chunk) # write to file
         end
-      ensure
-        # stop progress bar, wait for it to terminate
-        progress_bar.progress_bar_showing = false
-        progress_bar_thread.join
       end
+    ensure
+      # stop progress bar, wait for it to terminate
+      progress_bar.progress_bar_showing = false
+      progress_bar_thread.join
     end
   end
 rescue OpenSSL::SSL::SSLError
   # handle SSL errors
   ssl_error_retry += 1
-
-  if ssl_error_retry <= 3
-    retry
-  else
-    raise
-  end
+  ssl_error_retry <= 3 ? retry : raise
 end
 
 def external_downloader(uri, filename = File.basename(url), verbose = false)