If the config isn't found in the config set,
show_spec_config() cannot show the config.
But it return 0 on the situation though, so fix it.

Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Signed-off-by: Taeung Song <[email protected]>
---
 tools/perf/builtin-config.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index ece4558..6a4d8cd 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -97,7 +97,7 @@ static int show_spec_config(struct perf_config_set *set, 
const char *var)
                }
        }
 
-       return 0;
+       return -1;
 }
 
 static int show_config(struct perf_config_set *set)
-- 
2.7.4

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