Do not manually implement little endian integer conversion

Instead of manually bulding an integer from bytes, use the
`from_le_bytes()` method that all integer types implement.

Author: 00xc

src/lib.rs

@@ -309,11 +309,7 @@ macro_rules! impl_arbitrary_for_integers {
                 fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self> {
                     let mut buf = [0; mem::size_of::<$ty>()];
                     u.fill_buffer(&mut buf)?;
-                    let mut x: $unsigned = 0;
-                    for i in 0..mem::size_of::<$ty>() {
-                        x |= buf[i] as $unsigned << (i * 8);
-                    }
-                    Ok(x as $ty)
+                    Ok(Self::from_le_bytes(buf))
                 }
 
                 #[inline]