video_output: really fix use of uninitialized value.

src/video_output/video_output.c

@@ -2058,7 +2058,6 @@ static void DeinterlaceEnable( vout_thread_t *p_vout )
     }
 
     /* */
-    bool is_needed;
     if( i_deinterlace == -2 )
         p_vout->p->b_picture_interlaced = true;
     else if( i_deinterlace == -3 )
@@ -2066,8 +2065,6 @@ static void DeinterlaceEnable( vout_thread_t *p_vout )
     if( i_deinterlace < 0 )
         i_deinterlace = -1;
 
-    p_vout->p->b_picture_interlaced = is_needed;
-
     /* */
     val.psz_string = psz_deinterlace ? psz_deinterlace : p_optm->orig.psz;
     var_Change( p_vout, "deinterlace-mode", VLC_VAR_SETVALUE, &val, NULL );