Add a default to switch(image_format), suppresses a warning after a future patch.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@29869 b3059339-0415-0410-9bf9-f77b7e298cf2

libvo/vo_vdpau.c

@@ -578,11 +578,14 @@ static int create_vdp_decoder(int max_refs)
     case IMGFMT_VDPAU_VC1:
         vdp_decoder_profile = VDP_DECODER_PROFILE_VC1_ADVANCED;
         break;
+    default:
+        goto err_out;
     }
     vdp_st = vdp_decoder_create(vdp_device, vdp_decoder_profile,
                                 vid_width, vid_height, max_refs, &decoder);
     CHECK_ST_WARNING("Failed creating VDPAU decoder");
     if (vdp_st != VDP_STATUS_OK) {
+err_out:
         decoder = VDP_INVALID_HANDLE;
         decoder_max_refs = 0;
         return 0;