tools string: Use __fallthrough in perf_atoll()

The implicit fall through case label here is intended, so let us inform
that to gcc >= 7:

    CC       /tmp/build/perf/util/string.o
  util/string.c: In function 'perf_atoll':
  util/string.c:22:7: error: this statement may fall through [-Werror=implicit-fallthrough=]
      if (*p)
         ^
  util/string.c:24:3: note: here
     case '\0':
     ^~~~

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-0ophb30v9apkk6o95el0rqlq@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent b5bf1733
...@@ -21,6 +21,8 @@ s64 perf_atoll(const char *str) ...@@ -21,6 +21,8 @@ s64 perf_atoll(const char *str)
case 'b': case 'B': case 'b': case 'B':
if (*p) if (*p)
goto out_err; goto out_err;
__fallthrough;
case '\0': case '\0':
return length; return length;
default: default:
......
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