Minor update for readability

Author: royitaqi

lldb/source/Host/macosx/objcxx/Host.mm

@@ -624,8 +624,8 @@ DataExtractor data(arg_data.GetBytes(), arg_data_size,
 
           Environment &proc_env = process_info.GetEnvironment();
           bool is_simulator = false;
-          for (llvm::StringRef env_var;
-               !(env_var = data.GetCStr(&offset)).empty();) {
+          llvm::StringRef env_var;
+          while (!(env_var = data.GetCStr(&offset)).empty()) {
             if (check_for_ios_simulator &&
                 env_var.starts_with("SIMULATOR_UDID="))
               is_simulator = true;