clang's -Wcomma warning warns about suspicious use of the comma operator such as between two statements.
intl/uconv/util/nsUCSupport.cpp:552:34 [-Wcomma] possible misuse of comma operator here
MozReview-Commit-ID: Emk05qDJHbm
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extra : rebase_source : cfc7b16894f584f1e444e3296ab15c8d46f09698
extra : source : d61747509865b526772da48f94f9e1ba0548e6d3