hw/display : remove 'struct' from 'typedef QXL struct'

Signed-off-by: Chih-Min Chao <cmchao@gmail.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index b6d65b9..0cd314c 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -696,7 +696,7 @@
 
 /* called from spice server thread context only */
 static void interface_release_resource(QXLInstance *sin,
-                                       struct QXLReleaseInfoExt ext)
+                                       QXLReleaseInfoExt ext)
 {
     PCIQXLDevice *qxl = container_of(sin, PCIQXLDevice, ssd.qxl);
     QXLReleaseRing *ring;