Avoid using the result of `+=` like operator as an r-value in assignment

Description

Consider the following sample:
http://swiftify.me/9lc0rv
taken from https://clang.llvm.org/docs/ObjectiveCLiterals.html

should rather be:

Environment

None

Assignee

Ivan Kochurkin

Reporter

Alex Petuschak

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Git Branch Name

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GitHub Issue

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Components

Fix versions

Priority

Medium
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