[librsvg] Make a couple of unsafe calls nicer

[Federico Mena Quintero <federico src gnome org>]

commit 83c9e5016fcfc650406fa5dc17b7df43e61a1877
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Dec 27 21:00:59 2018 -0600

    Make a couple of unsafe calls nicer
    
    Thanks to Sebastian Dröge for the suggestion.

 rsvg_internals/src/handle.rs | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)
---
diff --git a/rsvg_internals/src/handle.rs b/rsvg_internals/src/handle.rs
index fc8f7cd7..ece4cb41 100644
--- a/rsvg_internals/src/handle.rs
+++ b/rsvg_internals/src/handle.rs
@@ -234,11 +234,11 @@ impl Handle {
         handle: *mut RsvgHandle,
         node: &RsvgNode,
     ) -> Result<(RsvgRectangle, RsvgRectangle), ()> {
-        let mut dimensions = unsafe { mem::zeroed() };
-
-        unsafe {
+        let dimensions = unsafe {
+            let mut dimensions = mem::zeroed();
             rsvg_handle_get_dimensions(handle, &mut dimensions);
-        }
+            dimensions
+        };
 
         if dimensions.width == 0 || dimensions.height == 0 {
             return Err(());
@@ -397,11 +397,11 @@ impl Handle {
             None
         };
 
-        let mut dimensions = unsafe { mem::zeroed() };
-
-        unsafe {
+        let dimensions = unsafe {
+            let mut dimensions = mem::zeroed();
             rsvg_handle_get_dimensions(handle, &mut dimensions);
-        }
+            dimensions
+        };
 
         if dimensions.width == 0 || dimensions.height == 0 {
             return Err(RenderingError::SvgHasNoSize);