sync: latest libbpf changes from kernel

Syncing latest libbpf commits from kernel repository.
Baseline bpf-next commit:   0737df6de94661ae55fd3343ce9abec32c687e62
Checkpoint bpf-next commit: 009367099eb61a4fc2af44d4eb06b6b4de7de6db
Baseline bpf commit:        3e9bc0472b910d4115e16e9c2d684c7757cb6c60
Checkpoint bpf commit:      3e9bc0472b910d4115e16e9c2d684c7757cb6c60

Andrii Nakryiko (6):
  libbpf: fix potential overflow in ring__consume_n()
  libbpf: fix ring_buffer__consume_n() return result logic
  libbpf: remove unnecessary struct_ops prog validity check
  libbpf: handle yet another corner case of nulling out struct_ops
    program
  libbpf: fix libbpf_strerror_r() handling unknown errors
  libbpf: improve early detection of doomed-to-fail BPF program loading

Jiri Olsa (2):
  libbpf: Fix error message in attach_kprobe_session
  libbpf: Fix error message in attach_kprobe_multi

Jose E. Marchesi (3):
  libbpf: Fix bpf_ksym_exists() in GCC
  libbpf: Avoid casts from pointers to enums in bpf_tracing.h
  bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD

 src/bpf_core_read.h |  1 +
 src/bpf_helpers.h   | 17 +++++++++--
 src/bpf_tracing.h   | 70 ++++++++++++++++++++++-----------------------
 src/libbpf.c        | 42 ++++++++++++++++++---------
 src/ringbuf.c       |  4 +--
 src/str_error.c     | 16 +++++++++--
 src/usdt.bpf.h      | 24 ++++++++--------
 7 files changed, 106 insertions(+), 68 deletions(-)

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

CHECKPOINT-COMMIT

@@ -1 +1 @@
-0737df6de94661ae55fd3343ce9abec32c687e62
+009367099eb61a4fc2af44d4eb06b6b4de7de6db