[Github-comments] [geany-plugins] scope: Ignore a false positive from cppcheck (#397)

[Colomban Wendling]

FTR, quoting [*ISO/IEC 9899:201x (C11), N1570*](http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf):

> ## 6.5.17 Comma operator
### Syntax
```
	expression:
		assignment-expression
		expression , assignment-expression
```
### Semantics
The left operand of a comma operator is evaluated as a void expression; there is a sequence point between its evaluation and that of the right operand. Then the right operand is evaluated; the result has its type and value. <sup>114)</sup>
>
<small>EXAMPLE As indicated by the syntax, the comma operator (as described in this subclause) cannot appear in contexts where a comma is used to separate items in a list (such as arguments to functions or lists of initializers). On the other hand, it can be used within a parenthesized expression or within the second expression of a conditional operator in such contexts. In the function call
```
	f(a, (t=3, t+2), c)
```
the function has three arguments, the second of which has the value 5.</small>

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