perf top: Fix error code in cmd_top()

perf top: Fix error code in cmd_top()

There are three error paths which return success:

1. Propagate the errno from evlist__create_maps() if it failed.

2. Return -EINVAL if top.sb_evlist is NULL.

3. Return -EINVAL if evlist__add_bpf_sb_event() failed.

Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220922141438.22487-4-shangxiaojing@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>