Dimitry Andric fe1b3370c1 Fix the following -Werror warning from clang 10.0.0 in rbootd:
libexec/rbootd/rmpproto.c:335:49: error: multiple unsequenced modifications to 'filename' [-Werror,-Wunsequenced]
        filename = (filename = strrchr(filepath,'/'))? ++filename: filepath;
                 ~                                     ^

MFC after:	3 days
2020-01-28 19:19:55 +00:00
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