Update lib/solid_queue/supervisor/pidfile.rb

Co-authored-by: Koichi ITO <[email protected]>

Author: yahonda

lib/solid_queue/supervisor/pidfile.rb

@@ -29,7 +29,7 @@ def check_status
         else
           FileUtils.mkdir_p File.dirname(path)
         end
-      rescue Errno::ESRCH => _e
+      rescue Errno::ESRCH
         # Process is dead, ignore, just delete the file
         delete
       rescue Errno::EPERM