bpf: Remove a redundant comment on bpf_prog_free

The comment telling that the prog_free helper is freeing the program is
not exactly useful, so just remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20211119163215.971383-3-hch@lst.de