Fix clippy

19_kernel_heap/README.md

@@ -828,7 +828,7 @@ diff -uNr 18_backtrace/kernel/src/console.rs 19_kernel_heap/kernel/src/console.r
 +
 +    static FIRST_SWITCH: InitStateLock<bool> = InitStateLock::new(true);
 +    FIRST_SWITCH.write(|first| {
-+        if *first == true {
++        if *first {
 +            *first = false;
 +
 +            buffer_console::BUFFER_CONSOLE.dump();

19_kernel_heap/kernel/src/console.rs

@@ -77,7 +77,7 @@ pub fn register_console(new_console: &'static (dyn interface::All + Sync)) {
 
     static FIRST_SWITCH: InitStateLock<bool> = InitStateLock::new(true);
     FIRST_SWITCH.write(|first| {
-        if *first == true {
+        if *first {
             *first = false;
 
             buffer_console::BUFFER_CONSOLE.dump();