src: resolve issues reported by coverity

The specific issues raised by Coverity are:

** CID 182716:  Control flow issues  (DEADCODE)
/src/node_file.cc: 1192
>>> CID 182716:  Control flow issues  (DEADCODE)
>>> Execution cannot reach this statement:
    "args->GetReturnValue().Set(...".

** CID 182715:  Uninitialized members  (UNINIT_CTOR)
/src/node_file.h: 29
>>> CID 182715:  Uninitialized members  (UNINIT_CTOR)
>>> Non-static class member "syscall_" is not initialized in this
    constructor nor in any functions that it calls.

PR-URL: #18629
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_file.cc

@@ -1192,13 +1192,9 @@ static void OpenFileHandle(const FunctionCallbackInfo<Value>& args) {
     req_wrap->SetReturnValue(args);
   } else {
     SYNC_CALL(open, *path, *path, flags, mode)
-    if (SYNC_RESULT < 0) {
-      args.GetReturnValue().Set(SYNC_RESULT);
-    } else {
-      HandleScope scope(env->isolate());
-      FileHandle* fd = new FileHandle(env, SYNC_RESULT);
-      args.GetReturnValue().Set(fd->object());
-    }
+    HandleScope scope(env->isolate());
+    FileHandle* fd = new FileHandle(env, SYNC_RESULT);
+    args.GetReturnValue().Set(fd->object());
   }
 }
 

src/node_file.h

@@ -62,7 +62,7 @@ class FSReqBase : public ReqWrap<uv_fs_t> {
 
  private:
   enum encoding encoding_ = UTF8;
-  const char* syscall_;
+  const char* syscall_ = nullptr;
 
   const char* data_ = nullptr;
   MaybeStackBuffer<char> buffer_;