perf bpf-filter: Return -ENOMEM directly when pfi allocation fails

Directly return -ENOMEM when pfi allocation fails,
instead of performing other operations on pfi.

Fixes: 0fe2b18d ("perf bpf-filter: Support multiple events properly")
Signed-off-by: Hao Ge <gehao@kylinos.cn>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: hao.ge@linux.dev
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20241113030537.26732-1-hao.ge@linux.dev


Signed-off-by: Namhyung Kim <namhyung@kernel.org>