Fix a couple of trivial clippy warnings

Author: sdroege

cairo/src/svg.rs

@@ -146,10 +146,11 @@ mod test {
         *surface.finish_output_stream().unwrap().downcast().unwrap()
     }
 
+    #[track_caller]
     fn assert_len_close_enough(len_a: usize, len_b: usize) {
         // It seems cairo randomizes some element IDs which might make one svg slightly
         // larger than the other. Here we make sure the difference is within ~10%.
-        let len_diff = (len_a as isize - len_b as isize).abs() as usize;
+        let len_diff = usize::abs_diff(len_a, len_b);
         assert!(len_diff < len_b / 10);
     }
 

glib-macros/src/utils.rs

@@ -248,7 +248,7 @@ mod tests {
             .required()
             .value_required();
         let _ = parse_nested_meta_items(&input.attrs, "boxed_type", &mut [&mut gtype_name]);
-        assert_eq!(gtype_name.get_found(), true);
+        assert!(gtype_name.get_found());
         assert_eq!(
             gtype_name.value.map(|x| x.value()),
             Some("Author".to_string())
@@ -271,6 +271,6 @@ mod tests {
         assert!(gtype_name.value.is_none());
 
         // The argument key must be found though
-        assert_eq!(gtype_name.get_found(), true);
+        assert!(gtype_name.get_found());
     }
 }

glib/src/translate.rs

@@ -958,7 +958,7 @@ macro_rules! impl_to_glib_container_from_slice_fundamental {
                 }
 
                 unsafe {
-                    let res = ffi::g_malloc(mem::size_of::<$name>() * t.len()) as *mut $name;
+                    let res = ffi::g_malloc(mem::size_of_val(t)) as *mut $name;
                     ptr::copy_nonoverlapping(t.as_ptr(), res, t.len());
                     res
                 }