perf_event_open_probe() and perf_event_{k,u}probe_open_legacy() helpers
are returning negative error codes directly on failure. This commit
changes bpf_program__attach_{k,u}probe_opts() to use those return
values directly instead of re-reading possibly changed errno.

Signed-off-by: Hoyeon Lee <hoyeon.lee@suse.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/lib/bpf/libbpf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 9ea41f40dc82..536c19c14d21 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -11835,7 +11835,7 @@ bpf_program__attach_kprobe_opts(const struct bpf_program *prog,
 						    offset, -1 /* pid */);
 	}
 	if (pfd < 0) {
-		err = -errno;
+		err = pfd;
 		pr_warn("prog '%s': failed to create %s '%s+0x%zx' perf event: %s\n",
 			prog->name, retprobe ? "kretprobe" : "kprobe",
 			func_name, offset,
@@ -12825,7 +12825,7 @@ bpf_program__attach_uprobe_opts(const struct bpf_program *prog, pid_t pid,
 						    binary_path, func_offset, pid);
 	}
 	if (pfd < 0) {
-		err = -errno;
+		err = pfd;
 		pr_warn("prog '%s': failed to create %s '%s:0x%zx' perf event: %s\n",
 			prog->name, retprobe ? "uretprobe" : "uprobe",
 			binary_path, func_offset,
-- 
2.52.0