Deal with two ultra-trivial warnings

src/font.rs

@@ -307,11 +307,11 @@ impl CTFont {
     pub fn get_bounding_rects_for_glyphs(&self, orientation: CTFontOrientation, glyphs: &[CGGlyph])
                                          -> CGRect {
         unsafe {
-            let mut result = CTFontGetBoundingRectsForGlyphs(self.as_concrete_TypeRef(),
-                                                             orientation,
-                                                             glyphs.as_ptr(),
-                                                             ptr::null_mut(),
-                                                             glyphs.len() as CFIndex);
+            let result = CTFontGetBoundingRectsForGlyphs(self.as_concrete_TypeRef(),
+                                                         orientation,
+                                                         glyphs.as_ptr(),
+                                                         ptr::null_mut(),
+                                                         glyphs.len() as CFIndex);
             result
         }
     }

src/font_descriptor.rs

@@ -274,7 +274,7 @@ impl CTFontDescriptor {
     pub fn font_path(&self) -> Option<String> {
         unsafe {
             let value = CTFontDescriptorCopyAttribute(self.obj, kCTFontURLAttribute);
-            if (value.is_null()) {
+            if value.is_null() {
                 return None;
             }