fix: http2 doesn't have pipelining queue (#2878)

Author: ronag

lib/dispatcher/client-h2.js

@@ -81,20 +81,12 @@ async function connectH2 (client, socket) {
 
     client[kSocket] = null
 
-    if (client.destroyed) {
-      assert(client[kPending] === 0)
-
-      // Fail entire queue.
-      const requests = client[kQueue].splice(client[kRunningIdx])
-      for (let i = 0; i < requests.length; i++) {
-        const request = requests[i]
-        errorRequest(client, request, err)
-      }
-    } else if (client[kRunning] > 0 && err.code !== 'UND_ERR_INFO') {
-      // Fail head of pipeline.
-      const request = client[kQueue][client[kRunningIdx]]
-      client[kQueue][client[kRunningIdx]++] = null
+    assert(client[kPending] === 0)
 
+    // Fail entire queue.
+    const requests = client[kQueue].splice(client[kRunningIdx])
+    for (let i = 0; i < requests.length; i++) {
+      const request = requests[i]
       errorRequest(client, request, err)
     }