test: refactor test-child-process-spawn-error

Change instances of assert.equal to assert.strictEqual.

PR-URL: nodejs#9937
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-child-process-spawn-error.js

@@ -5,13 +5,13 @@ var assert = require('assert');
 
 var enoentPath = 'foo123';
 var spawnargs = ['bar'];
-assert.equal(common.fileExists(enoentPath), false);
+assert.strictEqual(common.fileExists(enoentPath), false);
 
 var enoentChild = spawn(enoentPath, spawnargs);
 enoentChild.on('error', common.mustCall(function(err) {
-  assert.equal(err.code, 'ENOENT');
-  assert.equal(err.errno, 'ENOENT');
-  assert.equal(err.syscall, 'spawn ' + enoentPath);
-  assert.equal(err.path, enoentPath);
+  assert.strictEqual(err.code, 'ENOENT');
+  assert.strictEqual(err.errno, 'ENOENT');
+  assert.strictEqual(err.syscall, 'spawn ' + enoentPath);
+  assert.strictEqual(err.path, enoentPath);
   assert.deepStrictEqual(err.spawnargs, spawnargs);
 }));