Return false if there isn't a positive answer

Author: jvazquez-r7

modules/exploits/multi/http/zcm_file_upload.rb

@@ -110,6 +110,8 @@ def upload_war_and_exec(tomcat_path)
       # Success! Triggered the payload, should have a shell incoming
       return true if res.code == 200
     end
+
+    false
   end