sna: mark the pixmap as no longer clear after rendering video

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

src/sna/gen3_render.c

@@ -3745,6 +3745,7 @@ gen3_render_video(struct sna *sna,
 						  pix_xoff, pix_yoff);
 		}
 	}
+	priv->clear = false;
 
 	return TRUE;
 }

src/sna/gen4_render.c

@@ -1785,6 +1785,7 @@ gen4_render_video(struct sna *sna,
 		}
 		box++;
 	}
+	priv->clear = false;
 
 	gen4_vertex_flush(sna, &tmp);
 	return TRUE;

src/sna/gen5_render.c

@@ -1816,6 +1816,7 @@ gen5_render_video(struct sna *sna,
 		}
 		box++;
 	}
+	priv->clear = false;
 
 	gen5_vertex_flush(sna);
 	return TRUE;

src/sna/gen6_render.c

@@ -2028,6 +2028,7 @@ gen6_render_video(struct sna *sna,
 		}
 		box++;
 	}
+	priv->clear = false;
 
 	gen6_vertex_flush(sna);
 	return TRUE;

src/sna/gen7_render.c

@@ -2094,6 +2094,7 @@ gen7_render_video(struct sna *sna,
 		}
 		box++;
 	}
+	priv->clear = false;
 
 	gen7_vertex_flush(sna);
 	return TRUE;