message: Fix warnings about unnecessary `mut`
diff: @@ -359,8 +359,8 @@ fn collect_coverage(project: &Workspace,
  fn run_function(pid: Pid,
  forward_signals: bool,
  no_count: bool,
  - mut traces: &mut Vec<TracerData>,
  - mut breakpoints: &mut HashMap<u64, Breakpoint>) -> Result<i8, NixErr> {
  + traces: &mut Vec<TracerData>,
  + breakpoints: &mut HashMap<u64, Breakpoint>) -> Result<i8, NixErr> {
  let mut res = 0i8;
  // Thread count, don't count initial thread of execution
  let mut thread_count = 0isize;
  @@ -400,7 +400,7 @@ fn run_function(pid: Pid,
  false
  };
  if updated {
  - for mut t in traces.iter_mut()
  + for t in traces.iter_mut()
  .filter(|x| x.address == Some(rip)) {
  (*t).hits += 1;
  }
  