perf help: Fix a bug during strstart() conversion

The commit 8e99b6d4533c changed prefixcmp() to strstart() but missed to
change the return value in some place.  It makes perf help print
annoying output even for sane config items like below:

  $ perf help
  '.root': unsupported man viewer sub key.
  ...

Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Taeung Song <treeze.taeung@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Sihyeon Jang <uneedsihyeon@gmail.com>
Cc: kernel-team@lge.com
Link: http://lkml.kernel.org/r/20171114001542.GA16464@sejong
Fixes: 8e99b6d4533c ("tools include: Adopt strstarts() from the kernel")
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
index bd1fedef3d1c5d67a8ab6954467c24da622f2a27..a0f7ed2b869b0304408483e5660efa9167794a0e 100644 (file)
--- a/tools/perf/builtin-help.c
+++ b/tools/perf/builtin-help.c
@@ -284,7 +284,7 @@ static int perf_help_config(const char *var, const char *value, void *cb)
                add_man_viewer(value);
                return 0;
        }
-       if (!strstarts(var, "man."))
+       if (strstarts(var, "man."))
                return add_man_viewer_info(var, value);
 
        return 0;
@@ -314,7 +314,7 @@ static const char *cmd_to_page(const char *perf_cmd)
 
        if (!perf_cmd)
                return "perf";
-       else if (!strstarts(perf_cmd, "perf"))
+       else if (strstarts(perf_cmd, "perf"))
                return perf_cmd;
 
        return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;