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bpf: bpftool: Setting error code in do_loader()

We are missing setting error code in do_loader() when
bpf_object__open_file() fails. This means the command's exit status code
will be successful, even though the operation failed. So make sure to
return the correct error code. To maintain consistency with other
locations where bpf_object__open_file() is called, return -1.

[0] Closes: https://github.com/libbpf/bpftool/issues/156

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Sewon Nam <swnam0729@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Quentin Monnet <qmo@kernel.org>
Reviewed-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/bpf/d3b5b4b4-19bb-4619-b4dd-86c958c4a367@stanley.mountain/t/#u
Link: https://lore.kernel.org/bpf/20250311031238.14865-1-swnam0729@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

authored by

Sewon Nam and committed by
Alexei Starovoitov 02a46941 a9041fbd

+1
+1
tools/bpf/bpftool/prog.c
··· 1928 1928 1929 1929 obj = bpf_object__open_file(file, &open_opts); 1930 1930 if (!obj) { 1931 + err = -1; 1931 1932 p_err("failed to open object file"); 1932 1933 goto err_close_obj; 1933 1934 }