[librsvg] image: do not compute bbox if we are returning early

[Federico Mena Quintero <federico src gnome org>]

commit 45301442002dcd9bd9cec256f02aba13ea27b858
Author: Paolo Borelli <pborelli gnome org>
Date:   Mon Dec 31 17:28:41 2018 +0100

    image: do not compute bbox if we are returning early

 rsvg_internals/src/image.rs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/rsvg_internals/src/image.rs b/rsvg_internals/src/image.rs
index faf1cdbd..422ed32a 100644
--- a/rsvg_internals/src/image.rs
+++ b/rsvg_internals/src/image.rs
@@ -123,6 +123,12 @@ impl NodeTrait for NodeImage {
                     dc.clip(x, y, w, h);
                 }
 
+                let width = surface.get_width();
+                let height = surface.get_height();
+                if clipping || width == 0 || height == 0 {
+                    return Ok(());
+                }
+
                 // The bounding box for <image> is decided by the values of x, y, w, h and not by
                 // the final computed image bounds.
                 let bbox = BoundingBox::new(&dc.get_cairo_context().get_matrix()).with_rect(Some(
@@ -134,12 +140,6 @@ impl NodeTrait for NodeImage {
                     },
                 ));
 
-                let width = surface.get_width();
-                let height = surface.get_height();
-                if clipping || width == 0 || height == 0 {
-                    return Ok(());
-                }
-
                 let width = f64::from(width);
                 let height = f64::from(height);