Changed the server to return STATUS_* error codes.

diff --git a/server/trace.c b/server/trace.c
index 7fc5eb6..f140afb 100644
--- a/server/trace.c
+++ b/server/trace.c
@@ -1475,7 +1475,7 @@
 
 void trace_reply( struct thread *thread )
 {
-    fprintf( stderr, "%08x: %s() = %d",
+    fprintf( stderr, "%08x: %s() = %x",
              (unsigned int)thread, req_names[thread->last_req], thread->error );
     if (reply_dumpers[thread->last_req])
     {