MFC r357223:

MFC r357223:

Merge r357222 from the clang1000-import branch:

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;
                 ~                                     ^

git-svn-id: svn://svn.freebsd.org/base/stable/10@357517 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f