[librsvg] Fix unused variable warning

[Paolo Borelli <pborelli src gnome org>]

commit c5375910731ba33bdf2489f4a9d7fc136b57f569
Author: Paolo Borelli <pborelli gnome org>
Date:   Mon May 14 19:13:53 2018 +0200

    Fix unused variable warning

 librsvg/rsvg-drawing-ctx.c | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/librsvg/rsvg-drawing-ctx.c b/librsvg/rsvg-drawing-ctx.c
index 52e7867b..630227ff 100644
--- a/librsvg/rsvg-drawing-ctx.c
+++ b/librsvg/rsvg-drawing-ctx.c
@@ -979,7 +979,6 @@ rsvg_drawing_ctx_get_surface_of_node (RsvgDrawingCtx *ctx,
                                       double height)
 {
     cairo_surface_t *surface;
-    cairo_t *cr;
     cairo_t *save_cr = ctx->cr;
     cairo_t *save_initial_cr = ctx->initial_cr;
     double save_x = ctx->offset_x;