Save a disk file's drive type in the server object.

diff --git a/server/trace.c b/server/trace.c
index 7c68db2..ba98c0a 100644
--- a/server/trace.c
+++ b/server/trace.c
@@ -709,6 +709,7 @@
     fprintf( stderr, " sharing=%08x,", req->sharing );
     fprintf( stderr, " create=%d,", req->create );
     fprintf( stderr, " attrs=%08x,", req->attrs );
+    fprintf( stderr, " drive_type=%d,", req->drive_type );
     fprintf( stderr, " filename=" );
     cur_pos += dump_varargs_string( req );
 }
@@ -1032,7 +1033,8 @@
     fprintf( stderr, " header_size=%d,", req->header_size );
     fprintf( stderr, " base=%p,", req->base );
     fprintf( stderr, " shared_file=%d,", req->shared_file );
-    fprintf( stderr, " shared_size=%d", req->shared_size );
+    fprintf( stderr, " shared_size=%d,", req->shared_size );
+    fprintf( stderr, " drive_type=%d", req->drive_type );
 }
 
 static void dump_create_device_request( const struct create_device_request *req )