samples/bpf: Replace blk_account_io_done() with __blk_account_io_done()

Since commit be6bfe36 ("block: inline hot paths of blk_account_io_*()")
blk_account_io_*() become inline functions.
Signed-off-by: Rong Tao <rtoax@foxmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/tencent_1CC476835C219FACD84B6715F0D785517E07@qq.com

samples/bpf/task_fd_query_kern.c

@@ -10,7 +10,7 @@ int bpf_prog1(struct pt_regs *ctx)
 	return 0;
 }
 
-SEC("kretprobe/blk_account_io_done")
+SEC("kretprobe/__blk_account_io_done")
 int bpf_prog2(struct pt_regs *ctx)
 {
 	return 0;

samples/bpf/task_fd_query_user.c

@@ -348,7 +348,7 @@ int main(int argc, char **argv)
 	/* test two functions in the corresponding *_kern.c file */
 	CHECK_AND_RET(test_debug_fs_kprobe(0, "blk_mq_start_request",
 					   BPF_FD_TYPE_KPROBE));
-	CHECK_AND_RET(test_debug_fs_kprobe(1, "blk_account_io_done",
+	CHECK_AND_RET(test_debug_fs_kprobe(1, "__blk_account_io_done",
 					   BPF_FD_TYPE_KRETPROBE));
 
 	/* test nondebug fs kprobe */

samples/bpf/tracex3_kern.c

@@ -49,7 +49,7 @@ struct {
 	__uint(max_entries, SLOTS);
 } lat_map SEC(".maps");
 
-SEC("kprobe/blk_account_io_done")
+SEC("kprobe/__blk_account_io_done")
 int bpf_prog2(struct pt_regs *ctx)
 {
 	long rq = PT_REGS_PARM1(ctx);