Address comments

4 jobs from master in 19 minutes and 51 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #15303
build:linux

00:05:11

passed #15304
build:redox

00:17:48

 
  Test
failed #15306
allowed to fail
fmt

00:02:02

passed #15305
test:linux

00:01:05

 
Name Stage Failure
failed
fmt Test
-    let mut write_bitset : Option<&mut bitset> = writefds.map(|fd_set| &mut fd_set.fds_bits);
- let mut except_bitset : Option<&mut bitset> = exceptfds.map(|fd_set| &mut fd_set.fds_bits);
+ let mut read_bitset: Option<&mut bitset> = readfds.map(|fd_set| &mut fd_set.fds_bits);
+ let mut write_bitset: Option<&mut bitset> = writefds.map(|fd_set| &mut fd_set.fds_bits);
+ let mut except_bitset: Option<&mut bitset> = exceptfds.map(|fd_set| &mut fd_set.fds_bits);

// Keep track of the number of file descriptors that do not support epoll
let mut not_epoll = 0;
ERROR: Job failed: exit code 1