fail_function: fix wrong use of fei_attr_remove()

If register_kprobe() fails, the new attr is not added to the list yet, so
it should call fei_attr_free() intstead.

Link: https://lkml.kernel.org/r/20220826073337.2085798-3-yangyingliang@huawei.com
Fixes: 4b1a29a ("error-injection: Support fault injection framework")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

kernel/fail_function.c

@@ -295,7 +295,7 @@ static ssize_t fei_write(struct file *file, const char __user *buffer,
 
 	ret = register_kprobe(&attr->kp);
 	if (ret) {
-		fei_attr_remove(attr);
+		fei_attr_free(attr);
 		goto out;
 	}
 	fei_debugfs_add_attr(attr);