test: account for truthy signal in flaky async_hooks tests

test: account for truthy signal in flaky async_hooks tests · nodejs/node@bef67e4

Original file line number	Diff line number	Diff line change
`@@ -52,8 +52,12 @@ if (process.argv[2] === 'child') {`
`52`	`52`	`child.stderr.on('data', (d) => { errData = Buffer.concat([ errData, d ]); });`
`53`	`53`	`child.stdout.on('data', (d) => { outData = Buffer.concat([ outData, d ]); });`
`54`	`54`
`55`		`-child.on('close', common.mustCall((code) => {`
`56`		`-assert.strictEqual(code, 1);`
	`55`	`+child.on('close', common.mustCall((code, signal) => {`
	`56`	`+if (signal) {`
	`57`	+console.log(`Child closed with signal: ${signal}`);
	`58`	`+} else {`
	`59`	`+assert.strictEqual(code, 1);`
	`60`	`+}`
`57`	`61`	`assert.match(outData.toString(), heartbeatMsg,`
`58`	`62`	`'did not crash until we reached offending line of code ' +`
`59`	`63`	`(found ${outData})`);