Fix return value (it was missing completely).

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@31183 b3059339-0415-0410-9bf9-f77b7e298cf2

libvo/w32_common.c

@@ -390,7 +390,7 @@ static int createRenderingContext(void) {
 int vo_w32_config(uint32_t width, uint32_t height, uint32_t flags) {
     // we already have a fully initialized window, so nothing needs to be done
     if (flags & VOFLAG_HIDDEN)
-        return;
+        return 1;
     // store original size for videomode switching
     o_dwidth = width;
     o_dheight = height;