test: remove string literal from deepStrictEqual

PR-URL: #22742
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

test/parallel/test-zlib-from-concatenated-gzip.js

@@ -55,8 +55,8 @@ fs.createReadStream(pmmFileGz)
   })
   .on('data', (data) => pmmResultBuffers.push(data))
   .on('finish', common.mustCall(() => {
-    assert.deepStrictEqual(Buffer.concat(pmmResultBuffers), pmmExpected,
-                           'result should match original random garbage');
+    // Result should match original random garbage
+    assert.deepStrictEqual(Buffer.concat(pmmResultBuffers), pmmExpected);
   }));
 
 // test that the next gzip member can wrap around the input buffer boundary