[bug report] selftests/bpf: Factor out get_xlated_program() helper

Hello Hou Tao,

This is a semi-automatic email about new static checker warnings.

Commit b4b7a4099b8c ("selftests/bpf: Factor out get_xlated_program() helper") from Jan 5, 2024, leads to the following Smatch complaint:

./tools/testing/selftests/bpf/testing_helpers.c:455 get_xlated_program() warn: variable dereferenced before check 'buf' (see line 454)

./tools/testing/selftests/bpf/testing_helpers.c 453 *cnt = xlated_prog_len / buf_element_size; 454 *buf = calloc(*cnt, buf_element_size); 455 if (!buf) { ^^^ This should be *buf.

456 perror("can't allocate xlated program buffer"); 457 return -ENOMEM;

regards, dan carpenter