[librsvg] Remove oudated comment

[Paolo Borelli <pborelli src gnome org>]

commit 519edc218e60befbca698fcb41dc6f092cb582d3
Author: Paolo Borelli <pborelli gnome org>
Date:   Sat Apr 11 18:38:31 2020 +0200

    Remove oudated comment

 rsvg_internals/src/drawing_ctx.rs | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/rsvg_internals/src/drawing_ctx.rs b/rsvg_internals/src/drawing_ctx.rs
index 2ea3965a..beaadb37 100644
--- a/rsvg_internals/src/drawing_ctx.rs
+++ b/rsvg_internals/src/drawing_ctx.rs
@@ -766,7 +766,6 @@ impl DrawingCtx {
                             return Ok(child_surface);
                         }
 
-                        // FIXME: deal with out of memory here
                         return filters::render(
                             &filter_node,
                             values,