'continue' statement is unnecessary as the last statement in a loop

[sergioescala]

What is the purpose of the change

'continue' statement is unnecessary as the last statement in a loop

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #3046 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3046      +/-   ##
==========================================
- Coverage   64.37%   64.34%   -0.04%     
==========================================
  Files         584      584              
  Lines       26085    26084       -1     
  Branches     4559     4559              
==========================================
- Hits        16793    16783      -10     
- Misses       7115     7123       +8     
- Partials     2177     2178       +1

Impacted Files	Coverage Δ
...src/main/java/org/apache/dubbo/common/Version.java	50% <ø> (+0.58%)	⬆️
...ache/dubbo/remoting/transport/AbstractChannel.java	75% <0%> (-12.5%)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	43.42% <0%> (-10.53%)	⬇️
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	77.2% <0%> (-2.21%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	80.07% <0%> (-1.88%)	⬇️
...he/dubbo/registry/multicast/MulticastRegistry.java	63.79% <0%> (-1.73%)	⬇️
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	65.83% <0%> (-0.84%)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	67.78% <0%> (-0.68%)	⬇️
.../java/org/apache/dubbo/config/ReferenceConfig.java	56.01% <0%> (-0.38%)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	57.64% <0%> (+3.52%)	⬆️
... and 4 more

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[carryxyh]

Thx for your contribution. :)