Fix streams initialization in copyFileFallback (introduced by @unkelpehr)

lib/copy/copy.js

@@ -101,13 +101,13 @@ function copyFile (srcStat, src, dest, opts, cb) {
 
 function copyFileFallback (srcStat, src, dest, opts, cb) {
   const rs = fs.createReadStream(src)
-  const ws = fs.createWriteStream(dest, { mode: srcStat.mode })
-
   rs.on('error', err => cb(err))
-  ws.on('error', err => cb(err))
-
-  ws.on('open', () => rs.pipe(ws))
-    .once('close', () => setDestModeAndTimestamps(srcStat, dest, opts, cb))
+    .once('open', () => {
+      const ws = fs.createWriteStream(dest, { mode: srcStat.mode })
+      ws.on('error', err => cb(err))
+        .on('open', () => rs.pipe(ws))
+        .once('close', () => setDestModeAndTimestamps(srcStat, dest, opts, cb))
+    })
 }
 
 function setDestModeAndTimestamps (srcStat, dest, opts, cb) {
@@ -198,8 +198,8 @@ function onLink (src, dest, opts, cb) {
         if (resolvedDestPath === resolvedSrcPath) return cb()
 
         // prevent copy if src is a subdir of dest since unlinking
-        // dest in this case results in removing src contents
-        // and therefore a broken symlink will be created.
+        // dest in this case would result in removing src contents
+        // and therefore a broken symlink would be created.
         fs.stat(dest, (err, st) => {
           if (err) return cb(err)
           if (st.isDirectory() && isSrcSubdir(resolvedDestPath, resolvedSrcPath)) {