fix: check obj type in protobufBinding

[Tevic]

Change-Id: I194f7010835974b489b497c6d1f1b4e47b99864e

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Solve #2850

[codecov]

Codecov Report

Merging #2851 (479ec1a) into master (30cdbfc) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2851   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files          41       41           
  Lines        3054     3058    +4     
=======================================
+ Hits         3016     3020    +4     
  Misses         26       26           
  Partials       12       12           

Flag	Coverage Δ
go-1.13	98.75% <100.00%> (+<0.01%)	⬆️
go-1.14	98.59% <100.00%> (+<0.01%)	⬆️
go-1.15	98.59% <100.00%> (+<0.01%)	⬆️
go-1.16	98.59% <100.00%> (+<0.01%)	⬆️
macos-latest	98.75% <100.00%> (+<0.01%)	⬆️
nomsgpack	98.73% <100.00%> (+<0.01%)	⬆️
ubuntu-latest	98.75% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
binding/protobuf.go	100.00% <100.00%> (ø)

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[appleboy]

build fail

[thinkerou]

lgtm