chore: remove unreachable code to pass linter (denoland#7270)

cli/tests/unit/console_test.ts

@@ -720,9 +720,8 @@ unitTest(function consoleTestWithCustomInspector(): void {
 
 unitTest(function consoleTestWithCustomInspectorError(): void {
  class A {
- [customInspect](): string {
+ [customInspect](): never {
  throw new Error("BOOM");
- return "b";
  }
  }
 

std/fmt/printf.ts

@@ -319,53 +319,37 @@ class Printf {
  switch (this.verb) {
  case "t":
  return this.pad(arg.toString());
- break;
  case "b":
  return this.fmtNumber(arg as number, 2);
- break;
  case "c":
  return this.fmtNumberCodePoint(arg as number);
- break;
  case "d":
  return this.fmtNumber(arg as number, 10);
- break;
  case "o":
  return this.fmtNumber(arg as number, 8);
- break;
  case "x":
  return this.fmtHex(arg);
- break;
  case "X":
  return this.fmtHex(arg, true);
- break;
  case "e":
  return this.fmtFloatE(arg as number);
- break;
  case "E":
  return this.fmtFloatE(arg as number, true);
- break;
  case "f":
  case "F":
  return this.fmtFloatF(arg as number);
- break;
  case "g":
  return this.fmtFloatG(arg as number);
- break;
  case "G":
  return this.fmtFloatG(arg as number, true);
- break;
  case "s":
  return this.fmtString(arg as string);
- break;
  case "T":
  return this.fmtString(typeof arg);
- break;
  case "v":
  return this.fmtV(arg);
- break;
  case "j":
  return this.fmtJ(arg);
- break;
  default:
  return `%!(BAD VERB '${this.verb}')`;
  }