selftests/bpf: fix some typos in selftests

Hi, fix some spelling errors in selftest, the details are as follows:

-in the codes:
	test_bpf_sk_stoarge_map_iter_fd(void)
		->test_bpf_sk_storage_map_iter_fd(void)
	load BTF from btf_data.o->load BTF from btf_data.bpf.o

-in the code comments:
	preample->preamble
	multi-contollers->multi-controllers
	errono->errno
	unsighed/unsinged->unsigned
	egree->egress
	shoud->should
	regsiter->register
	assummed->assumed
	conditiona->conditional
	rougly->roughly
	timetamp->timestamp
	ingores->ignores
	null-termainted->null-terminated
	slepable->sleepable
	implemenation->implementation
	veriables->variables
	timetamps->timestamps
	substitue a costant->substitute a constant
	secton->section
	unreferened->unreferenced
	verifer->verifier
	libppf->libbpf
...

Signed-off-by: Lin Yikai <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/user_ringbuf.c b/tools/testing/selftests/bpf/prog_tests/user_ringbuf.c
index dfff6feac12c..d424e7ecbd12 100644
--- a/tools/testing/selftests/bpf/prog_tests/user_ringbuf.c
+++ b/tools/testing/selftests/bpf/prog_tests/user_ringbuf.c
@@ -643,7 +643,7 @@ static void test_user_ringbuf_blocking_reserve(void)
 	if (!ASSERT_EQ(err, 0, "deferred_kick_thread\n"))
 		goto cleanup;
 
-	/* After spawning another thread that asychronously kicks the kernel to
+	/* After spawning another thread that asynchronously kicks the kernel to
 	 * drain the messages, we're able to block and successfully get a
 	 * sample once we receive an event notification.
 	 */