add newline to transmutes_expressible_as_ptr_casts.rs

Author: Ryan1729

tests/ui/transmutes_expressible_as_ptr_casts.rs

@@ -73,4 +73,4 @@ fn main() {
 // fall through into `do_check`.
 fn trigger_do_check_to_emit_error(in_param: &[i32; 1]) -> *const u8 {
     unsafe { transmute::<&[i32; 1], *const u8>(in_param) }
-}
+}