tools: enable no-unsafe-finally

This enables the `no-unsafe-finally` eslint rule to make sure we
have a proper control flow in try / catch.

PR-URL: nodejs#18745
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

.eslintrc.yaml

@@ -152,6 +152,7 @@ rules:
   }]
   no-tabs: error
   no-trailing-spaces: error
+  no-unsafe-finally: error
   object-curly-spacing: [error, always]
   one-var-declaration-per-line: error
   operator-linebreak: [error, after]

test/common/index.js

@@ -504,21 +504,13 @@ exports.canCreateSymLink = function() {
     const whoamiPath = path.join(process.env['SystemRoot'],
                                  'System32', 'whoami.exe');
 
-    let err = false;
-    let output = '';
-
     try {
-      output = execSync(`${whoamiPath} /priv`, { timout: 1000 });
+      const output = execSync(`${whoamiPath} /priv`, { timout: 1000 });
+      return output.includes('SeCreateSymbolicLinkPrivilege');
     } catch (e) {
-      err = true;
-    } finally {
-      if (err || !output.includes('SeCreateSymbolicLinkPrivilege')) {
-        return false;
-      }
+      return false;
     }
   }
-
-  return true;
 };
 
 exports.getCallSite = function getCallSite(top) {