samples/bpf: fix uninitialized warning with test_current_task_under_cgroup

samples/bpf: fix uninitialized warning with test_current_task_under_cgroup

Currently, compiling samples/bpf with LLVM warns about the uninitialized
use of variable with test_current_task_under_cgroup.

    ./samples/bpf/test_current_task_under_cgroup_user.c:57:6:
    warning: variable 'cg2' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
	    if (setup_cgroup_environment())
		^~~~~~~~~~~~~~~~~~~~~~~~~~
    ./samples/bpf/test_current_task_under_cgroup_user.c:106:8:
    note: uninitialized use occurs here
	    close(cg2);
		  ^~~
    ./samples/bpf/test_current_task_under_cgroup_user.c:57:2:
    note: remove the 'if' if its condition is always false
	    if (setup_cgroup_environment())
	    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ./samples/bpf/test_current_task_under_cgroup_user.c:19:9:
    note: initialize the variable 'cg2' to silence this warning
	    int cg2, idx = 0, rc = 1;
		   ^
		    = 0
    1 warning generated.

This commit resolve this compiler warning by pre-initialize the variable
with error for safeguard.

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221218061453.6287-4-danieltimlee@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>