Add missing .to_i

Author: supechicken

crew-sudo

@@ -15,7 +15,7 @@ when 'crew-sudo'
     runas_client(ARGV[1..-1])
   when 'stop-daemon'
     exit(0) unless File.exist?(PID_FILE_PATH)
-    pid = File.read(PID_FILE_PATH)
+    pid = File.read(PID_FILE_PATH).to_i
 
     begin
       Process.kill('TERM', pid)