lib: remove unnecessary string interpolation

PR-URL: #20890
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Jackson Tian <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>

lib/internal/process/warning.js

@@ -83,7 +83,7 @@ function setupProcessWarnings() {
       if (isDeprecation && process.noDeprecation) return;
       const trace = process.traceProcessWarnings ||
                     (isDeprecation && process.traceDeprecation);
-      var msg = `${prefix}`;
+      var msg = prefix;
       if (warning.code)
         msg += `[${warning.code}] `;
       if (trace && warning.stack) {