processBody doesn't need to return a promise (#2858)

lib/web/fetch/index.js

@@ -204,7 +204,7 @@ function fetch (input, init = undefined) {
   const processResponse = (response) => {
     // 1. If locallyAborted is true, terminate these substeps.
     if (locallyAborted) {
-      return Promise.resolve()
+      return
     }
 
     // 2. If response’s aborted flag is set, then:
@@ -217,14 +217,14 @@ function fetch (input, init = undefined) {
       //    deserializedError.
 
       abortFetch(p, request, responseObject, controller.serializedAbortReason)
-      return Promise.resolve()
+      return
     }
 
     // 3. If response is a network error, then reject p with a TypeError
     // and terminate these substeps.
     if (response.type === 'error') {
       p.reject(new TypeError('fetch failed', { cause: response.error }))
-      return Promise.resolve()
+      return
     }
 
     // 4. Set responseObject to the result of creating a Response object,