drm/sti: fix cursor coordinates

fix x/y typo while setting cursor coordinates
Signed-off-by: NFabien Dessenne <fabien.dessenne@st.com>
Reviewed-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: NVincent Abriou <vincent.abriou@st.com>

drivers/gpu/drm/sti/sti_cursor.c

@@ -205,7 +205,7 @@ static void sti_cursor_atomic_update(struct drm_plane *drm_plane,
 	writel(cursor->height << 16 | cursor->width, cursor->regs + CUR_SIZE);
 
 	y = sti_vtg_get_line_number(*mode, dst_y);
-	x = sti_vtg_get_pixel_number(*mode, dst_y);
+	x = sti_vtg_get_pixel_number(*mode, dst_x);
 	writel((y << 16) | x, cursor->regs + CUR_VPO);
 
 	plane->status = STI_PLANE_UPDATED;