davinci video: fix error path

modules/codec/davinci/video.c

@@ -231,6 +231,7 @@ static picture_t *DecodeVideoBlockInner( decoder_t *p_dec, block_t **pp_block, i
 {
     decoder_sys_t *p_sys = p_dec->p_sys;
     block_t *p_block;
+    picture_t *p_pic = NULL;
     VIDDEC_InArgs in_args;
     VIDDEC_OutArgs out_args;
     VIDDEC_DynamicParams dparams;
@@ -395,7 +396,7 @@ static picture_t *DecodeVideoBlockInner( decoder_t *p_dec, block_t **pp_block, i
                                     / status.outputHeight; /* FIXME */
 
     /* Get a new picture */
-    picture_t *p_pic = decoder_NewPicture( p_dec );
+    p_pic = decoder_NewPicture( p_dec );
     if( !p_pic )
     {
         msg_Err( p_dec, "Could not get picture" );