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gdb_handlesig()'s behaviour is not entirely obvious at first glance. Add a doc comment for it, and also add a comment explaining why it's ok for gdb_do_syscallv() to ignore gdb_handlesig()'s return value. (Coverity complains about this: CID 1390850.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <20180515181958.25837-1-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>