Fix few warnings

5 jobs for warning in 8 minutes and 25 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #18695
build:linux

00:01:20

passed #18696
build:redox

00:01:14

 
  Test
failed #18699
allowed to fail
fmt

00:01:25

passed #18697
test:linux

00:01:25

passed #18698
test:redox

00:07:04

 
Name Stage Failure
failed
fmt Test
+pub unsafe extern "C" fn wcstoul(
+ mut ptr: *const wchar_t,
+ end: *mut *mut wchar_t,
+ base: c_int,
+) -> c_ulong {
skipws!(ptr);
let result = strtou_impl!(c_ulong, ptr, base);
if !end.is_null() {
ERROR: Job failed: exit code 1