bpf: Remove truncation test in bpf_strtol and bpf_strtoul helpers

bpf: Remove truncation test in bpf_strtol and bpf_strtoul helpers

Both bpf_strtol() and bpf_strtoul() helpers passed a temporary "long long"
respectively "unsigned long long" to __bpf_strtoll() / __bpf_strtoull().

Later, the result was checked for truncation via _res != ({unsigned,} long)_res
as the destination buffer for the BPF helpers was of type {unsigned,} long
which is 32bit on 32bit architectures.

Given the latter was a bug in the helper signatures where the destination buffer
got adjusted to {s,u}64, the truncation check can now be removed.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240913191754.13290-2-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>