fix bug for decode regist rm request

[leizhiyuan]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

no need

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

review it please

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #872 into develop will increase coverage by 0.18%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop     #872      +/-   ##
=============================================
+ Coverage      38.26%   38.45%   +0.18%     
- Complexity      1013     1015       +2     
=============================================
  Files            220      220              
  Lines           8499     8504       +5     
  Branches        1023     1023              
=============================================
+ Hits            3252     3270      +18     
+ Misses          4861     4848      -13     
  Partials         386      386

Impacted Files	Coverage Δ	Complexity Δ
...java/io/seata/core/protocol/RegisterRMRequest.java	70.14% <100%> (+2.4%)	8 <0> (ø)	⬇️
...eata/server/store/FileTransactionStoreManager.java	53% <0%> (-0.5%)	15% <0%> (ø)
...eata/core/rpc/netty/AbstractRpcRemotingClient.java	20.57% <0%> (+2.87%)	7% <0%> (ø)	⬇️
...ain/java/io/seata/core/rpc/netty/ShutdownHook.java	81.25% <0%> (+25%)	8% <0%> (+2%)	⬆️

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[slievrly]

LGTM

[zhangthen]

+1