server: Fixed process exit code on FreeBSD.

server/process.c

@@ -660,7 +660,7 @@ void kill_process( struct process *process, struct thread *skip, int exit_code )
     {
         struct thread *thread = LIST_ENTRY( ptr, struct thread, proc_entry );
 
-        thread->exit_code = exit_code;
+        if (exit_code) thread->exit_code = exit_code;
         if (thread != skip) kill_thread( thread, 1 );
     }
 }

server/request.c

@@ -389,9 +389,12 @@ int receive_fd( struct process *process )
         return 0;
     }
 
-    if (ret >= 0)
+    if (!ret)
+    {
+        kill_process( process, NULL, 0 );
+    }
+    else if (ret > 0)
     {
-        if (ret > 0)
         fprintf( stderr, "Protocol error: process %p: partial recvmsg %d for fd\n",
                  process, ret );
         kill_process( process, NULL, 1 );