message: Use `let = if;` instead of `let; if`.
diff: @@ -55,16 +55,14 @@ pub fn futex<'tcx>(
  op if op & !futex_realtime == futex_wait || op & !futex_realtime == futex_wait_bitset => {
  let wait_bitset = op & !futex_realtime == futex_wait_bitset;
  - let bitset;
  -
  - if wait_bitset {
  + let bitset = if wait_bitset {
  if args.len() != 7 {
  throw_ub_format!(
  "incorrect number of arguments for `futex` syscall with `op=FUTEX_WAIT_BITSET`: got {}, expected 7",
  args.len()
  );
  }
  - bitset = this.read_scalar(&args[6])?.to_u32()?;
  + this.read_scalar(&args[6])?.to_u32()?
  } else {
  if args.len() < 5 {
  throw_ub_format!(
  @@ -72,8 +70,8 @@ pub fn futex<'tcx>(
  args.len()
  );
  }
  - bitset = u32::MAX;
  - }
  + u32::MAX
  + };
  if bitset == 0 {
  let einval = this.eval_libc("EINVAL")?;
  @@ -182,18 +180,17 @@ pub fn futex<'tcx>(
  // FUTEX_WAKE_BITSET: (int *addr, int op = FUTEX_WAKE, int val, const timespect *_unused, int *_unused, unsigned int bitset)
  // Same as FUTEX_WAKE, but allows you to specify a bitset to select which threads to wake up.
  op if op == futex_wake || op == futex_wake_bitset => {
  - let bitset;
  - if op == futex_wake_bitset {
  + let bitset = if op == futex_wake_bitset {
  if args.len() != 7 {
  throw_ub_format!(
  "incorrect number of arguments for `futex` syscall with `op=FUTEX_WAKE_BITSET`: got {}, expected 7",
  args.len()
  );
  }
  - bitset = this.read_scalar(&args[6])?.to_u32()?;
  + this.read_scalar(&args[6])?.to_u32()?
  } else {
  - bitset = u32::MAX;
  - }
  + u32::MAX
  + };
  if bitset == 0 {
  let einval = this.eval_libc("EINVAL")?;
  this.set_last_error(einval)?;
  