avoid unneeded call indirection

lib/internal/errors.js

@@ -428,11 +428,6 @@ function uvErrmapGet(name) {
   return MapPrototypeGet(uvBinding.errmap, name);
 }
 
-function uvGetFullErrMap() {
-  uvBinding = lazyUv();
-  return uvBinding.getErrorMap();
-}
-
 const captureLargerStackTrace = hideStackFrames(
   function captureLargerStackTrace(err) {
     userStackTraceLimit = Error.stackTraceLimit;
@@ -787,7 +782,6 @@ module.exports = {
   isStackOverflowError,
   connResetException,
   uvErrmapGet,
-  uvGetFullErrMap,
   uvException,
   uvExceptionWithHostPort,
   SystemError,

lib/internal/util.js

@@ -35,7 +35,6 @@ const {
     ERR_UNKNOWN_SIGNAL
   },
   uvErrmapGet,
-  uvGetFullErrMap,
   overrideStackTrace,
 } = require('internal/errors');
 const { signals } = internalBinding('constants').os;
@@ -54,6 +53,16 @@ const experimentalWarnings = new SafeSet();
 
 const colorRegExp = /\u001b\[\d\d?m/g; // eslint-disable-line no-control-regex
 
+
+let uvBinding;
+
+function lazyUv() {
+  if (!uvBinding) {
+    uvBinding = internalBinding('uv');
+  }
+  return uvBinding;
+}
+
 function removeColors(str) {
   return StringPrototypeReplace(str, colorRegExp, '');
 }
@@ -288,7 +297,8 @@ function getSystemErrorName(err) {
 }
 
 function getSystemErrorMap() {
-  return uvGetFullErrMap();
+  uvBinding = lazyUv();
+  return uvBinding.getErrorMap();
 }
 
 const kCustomPromisifiedSymbol = SymbolFor('nodejs.util.promisify.custom');

lib/util.js

@@ -68,7 +68,7 @@ const types = require('internal/util/types');
 const {
   deprecate,
   getSystemErrorName: internalErrorName,
-  getSystemErrorMap: internalErrorMap,
+  getSystemErrorMap,
   promisify
 } = require('internal/util');
 
@@ -245,10 +245,6 @@ function getSystemErrorName(err) {
   }
   return internalErrorName(err);
 }
-
-function getSystemErrorMap() {
-  return internalErrorMap();
-}
 // Keep the `exports =` so that various functions can still be monkeypatched
 module.exports = {
   _errnoException: errnoException,