drm/sti: fix cursor coordinates

fix x/y typo while setting cursor coordinates

Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Vincent Abriou <vincent.abriou@st.com>
diff --git a/drivers/gpu/drm/sti/sti_cursor.c b/drivers/gpu/drm/sti/sti_cursor.c
index 8078631..a19693a 100644
--- a/drivers/gpu/drm/sti/sti_cursor.c
+++ b/drivers/gpu/drm/sti/sti_cursor.c
@@ -205,7 +205,7 @@
 	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;