Code format

[gaoxinge]

What this PR does:

• clean code

Special notes for your reviewer:

• NONE

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #199 into master will increase coverage by 0.02%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
+ Coverage   66.39%   66.41%   +0.02%     
==========================================
  Files          22       22              
  Lines        2845     2835      -10     
==========================================
- Hits         1889     1883       -6     
+ Misses        740      738       -2     
+ Partials      216      214       -2     

Impacted Files	Coverage Δ
string.go	57.91% <87.50%> (-0.07%)	⬇️

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[wongoo]

@gaoxinge can u add some comment for the change pls?

[gaoxinge]

@wongoo @zonghaishang @AlexStocks

• 移除

if chunkLen < 0 {
    chunkLen = 0
}

这段条件赋值是因为这段代码是在chunkLen <= 0的前提下执行的：

dubbo-go-hessian2/string.go

Line 327 in f7b44b5

if chunkLen <= 0 {

所以这段代码等价于chunkLen = 0。

• 移除

if charLen < 0 {
    charLen = 0
}

是因为charLen是通过getStringLength获得的，因此我倾向于在getStringLength里面检查charLen的合法性，并以报错的形式呈现。

• 把chunkLen += charLen改成chunkLen = charLen是因为chunkLen = 0一定成立，所以把原地加法改成了赋值。

[zonghaishang]

如果读取的chunkLen是负数怎么办？ err也不是nil ?

[gaoxinge]

@zonghaishang

在getStringLength里面添加了字符串长度的检查：

dubbo-go-hessian2/string.go

Lines 252 to 254 in ca016b0

	if length < 0 {
	return -1, perrors.Errorf("string decode: length less than zero")
	}

[gaoxinge]

@zonghaishang @wongoo @AlexStocks 经过多次讨论，还是把检查字符串长度的代码逻辑去掉了 。因为理论上hessian保证了解析出来的长度一定大于等于0的。如果返回了小于0的值，那只可能是getStringLength有bug。

[wongoo]

LGTM