Remove redundant code

[thelproad]

Remove redundant code.

[codecov-io]

Codecov Report

Merging #4885 into master will decrease coverage by 0.16%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master    #4885      +/-   ##
============================================
- Coverage     63.99%   63.83%   -0.17%     
+ Complexity      451      448       -3     
============================================
  Files           769      769              
  Lines         33161    33125      -36     
  Branches       5230     5204      -26     
============================================
- Hits          21221    21144      -77     
- Misses         9522     9561      +39     
- Partials       2418     2420       +2

Impacted Files	Coverage Δ	Complexity Δ
...bo/rpc/protocol/dubbo/telnet/LogTelnetHandler.java	69.69% <ø> (-1.74%)	0 <0> (ø)
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	83.45% <100%> (+2.57%)	0 <0> (ø)	⬇️
...ubbo/rpc/protocol/nativethrift/ThriftProtocol.java	71.79% <50%> (-0.71%)	8 <0> (ø)
...ache/dubbo/remoting/transport/AbstractChannel.java	37.5% <0%> (-50%)	0% <0%> (ø)
...g/apache/dubbo/rpc/protocol/http/HttpProtocol.java	46.03% <0%> (-21.83%)	6% <0%> (-5%)
...che/dubbo/remoting/transport/mina/MinaChannel.java	43.42% <0%> (-10.53%)	16% <0%> (-1%)
.../remoting/transport/netty4/NettyServerHandler.java	61.9% <0%> (-9.53%)	0% <0%> (ø)
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-8.7%)	0% <0%> (ø)
...mmon/threadpool/support/fixed/FixedThreadPool.java	80% <0%> (-7.5%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	51.42% <0%> (-5.72%)	0% <0%> (ø)
... and 40 more

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[beiwei30]

LGTM