Apply clippy suggestions

library/std/src/io/buffered/bufreader.rs

@@ -242,14 +242,13 @@ impl<R: Seek> BufReader<R> {
                 self.pos = new_pos as usize;
                 return Ok(());
             }
-        } else {
-            if let Some(new_pos) = pos.checked_add(offset as u64) {
-                if new_pos <= self.cap as u64 {
-                    self.pos = new_pos as usize;
-                    return Ok(());
-                }
+        } else if let Some(new_pos) = pos.checked_add(offset as u64) {
+            if new_pos <= self.cap as u64 {
+                self.pos = new_pos as usize;
+                return Ok(());
             }
         }
+
         self.seek(SeekFrom::Current(offset)).map(drop)
     }
 }

library/std/src/sys/windows/fs.rs

@@ -558,7 +558,7 @@ impl IntoInner<Handle> for File {
 
 impl FromInner<Handle> for File {
     fn from_inner(handle: Handle) -> File {
-        File { handle: handle }
+        File { handle }
     }
 }
 
@@ -672,7 +672,7 @@ impl FilePermissions {
 
 impl FileType {
     fn new(attrs: c::DWORD, reparse_tag: c::DWORD) -> FileType {
-        FileType { attributes: attrs, reparse_tag: reparse_tag }
+        FileType { attributes: attrs, reparse_tag }
     }
     pub fn is_dir(&self) -> bool {
         !self.is_symlink() && self.is_directory()

library/std/src/sys/windows/stack_overflow.rs

@@ -9,10 +9,10 @@ impl Handler {
     pub unsafe fn new() -> Handler {
         // This API isn't available on XP, so don't panic in that case and just
         // pray it works out ok.
-        if c::SetThreadStackGuarantee(&mut 0x5000) == 0 {
-            if c::GetLastError() as u32 != c::ERROR_CALL_NOT_IMPLEMENTED as u32 {
-                panic!("failed to reserve stack space for exception handling");
-            }
+        if c::SetThreadStackGuarantee(&mut 0x5000) == 0
+            && c::GetLastError() as u32 != c::ERROR_CALL_NOT_IMPLEMENTED as u32
+        {
+            panic!("failed to reserve stack space for exception handling");
         }
         Handler
     }

library/std/src/sys_common/backtrace.rs

@@ -93,10 +93,8 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
         if stop {
             return false;
         }
-        if !hit {
-            if start {
-                res = bt_fmt.frame().print_raw(frame.ip(), None, None, None);
-            }
+        if !hit && start {
+            res = bt_fmt.frame().print_raw(frame.ip(), None, None, None);
         }
 
         idx += 1;