Use lock constructor in console

Mostly to make sure what I just did works.

Use lock constructor in console
de5ed123 · Austin Clements · da450a4f · de5ed123
--- a/kernel/console.cc
+++ b/kernel/console.cc
@@ -25,9 +25,12 @@

 static int panicked = 0;

-static struct {
+static struct cons {
  struct spinlock lock;
  int locking;
+
+  constexpr cons()
+    : lock("console", LOCKSTAT_CONSOLE), locking(0) { }
 } cons;

 static void
@@ -358,7 +361,6 @@ console_stream uerr(false);
 void
 initconsole(void)
 {
-  initlock(&cons.lock, "console", LOCKSTAT_CONSOLE);
  cons.locking = 1;

  devsw[MAJ_CONSOLE].write = consolewrite;