d3d9: Void functions should not return a value (contd.)

[Andrew Talbot]

Changelog:
    d3d9: Void functions should not return a value.

diff -urN a/dlls/d3d9/volumetexture.c b/dlls/d3d9/volumetexture.c
--- a/dlls/d3d9/volumetexture.c	2006-12-18 11:36:17.000000000 +0000
+++ b/dlls/d3d9/volumetexture.c	2007-04-07 22:31:11.000000000 +0100
@@ -105,7 +105,7 @@
 static void WINAPI IDirect3DVolumeTexture9Impl_PreLoad(LPDIRECT3DVOLUMETEXTURE9 iface) {
     IDirect3DVolumeTexture9Impl *This = (IDirect3DVolumeTexture9Impl *)iface;
     TRACE("(%p) Relay\n", This);
-    return IWineD3DVolumeTexture_PreLoad(This->wineD3DVolumeTexture);
+    IWineD3DVolumeTexture_PreLoad(This->wineD3DVolumeTexture);
 }
 
 static D3DRESOURCETYPE WINAPI IDirect3DVolumeTexture9Impl_GetType(LPDIRECT3DVOLUMETEXTURE9 iface) {
@@ -148,7 +148,7 @@
 static void WINAPI IDirect3DVolumeTexture9Impl_GenerateMipSubLevels(LPDIRECT3DVOLUMETEXTURE9 iface) {
     IDirect3DVolumeTexture9Impl *This = (IDirect3DVolumeTexture9Impl *)iface;
     TRACE("(%p) Relay\n", This);
-    return IWineD3DVolumeTexture_GenerateMipSubLevels(This->wineD3DVolumeTexture);
+    IWineD3DVolumeTexture_GenerateMipSubLevels(This->wineD3DVolumeTexture);
 }
 
 /* IDirect3DVolumeTexture9 Interface follow: */