Fix Clippy warnings (legacy_numeric_constants) + some unused imports

Author: rafalh

src/boot_sector.rs

@@ -1,6 +1,4 @@
 use core::slice;
-use core::u16;
-use core::u8;
 
 use crate::dir_entry::DIR_ENTRY_SIZE;
 use crate::error::{Error, IoError};
@@ -820,7 +818,6 @@ pub(crate) fn format_boot_sector<E: IoError>(
 #[cfg(test)]
 mod tests {
     use super::*;
-    use core::u32;
 
     fn init() {
         let _ = env_logger::builder().is_test(true).try_init();

src/dir.rs

@@ -1,6 +1,5 @@
 #[cfg(all(not(feature = "std"), feature = "alloc", feature = "lfn"))]
 use alloc::vec::Vec;
-use core::char;
 use core::num;
 use core::str;
 #[cfg(feature = "lfn")]

src/dir_entry.rs

@@ -6,7 +6,6 @@ use core::convert::TryInto;
 use core::fmt;
 #[cfg(not(feature = "unicode"))]
 use core::iter;
-use core::str;
 
 #[cfg(feature = "lfn")]
 use crate::dir::LfnBuffer;

src/file.rs

@@ -6,7 +6,7 @@ use crate::fs::{FileSystem, ReadWriteSeek};
 use crate::io::{IoBase, Read, Seek, SeekFrom, Write};
 use crate::time::{Date, DateTime, TimeProvider};
 
-const MAX_FILE_SIZE: u32 = core::u32::MAX;
+const MAX_FILE_SIZE: u32 = u32::MAX;
 
 /// A FAT filesystem file object used for reading and writing data.
 ///

src/fs.rs

@@ -2,11 +2,9 @@
 use alloc::string::String;
 use core::borrow::BorrowMut;
 use core::cell::{Cell, RefCell};
-use core::char;
 use core::convert::TryFrom;
 use core::fmt::Debug;
 use core::marker::PhantomData;
-use core::u32;
 
 use crate::boot_sector::{format_boot_sector, BiosParameterBlock, BootSector};
 use crate::dir::{Dir, DirRawStream};