lib/test_kmod: fix kernel-doc warnings

Fix all kernel-doc warnings in test_kmod.c:
- Mark some enum values as private so that kernel-doc is not needed
  for them
- s/thread_mutex/thread_lock/ in a struct's kernel-doc comments
- add kernel-doc info for @task_sync

test_kmod.c:67: warning: Enum value '__TEST_KMOD_INVALID' not described in enum 'kmod_test_case'
test_kmod.c:67: warning: Enum value '__TEST_KMOD_MAX' not described in enum 'kmod_test_case'
test_kmod.c💯 warning: Function parameter or member 'task_sync' not described in 'kmod_test_device_info'
test_kmod.c:134: warning: Function parameter or member 'thread_mutex' not described in 'kmod_test_device'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc:  <linux-modules@vger.kernel.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

lib/test_kmod.c

@@ -58,11 +58,14 @@ static int num_test_devs;
  * @need_mod_put for your tests case.
  */
 enum kmod_test_case {
+	/* private: */
 	__TEST_KMOD_INVALID = 0,
+	/* public: */
 
 	TEST_KMOD_DRIVER,
 	TEST_KMOD_FS_TYPE,
 
+	/* private: */
 	__TEST_KMOD_MAX,
 };
 
@@ -82,6 +85,7 @@ struct kmod_test_device;
  * @ret_sync: return value if request_module() is used, sync request for
  * 	@TEST_KMOD_DRIVER
  * @fs_sync: return value of get_fs_type() for @TEST_KMOD_FS_TYPE
+ * @task_sync: kthread's task_struct or %NULL if not running
  * @thread_idx: thread ID
  * @test_dev: test device test is being performed under
  * @need_mod_put: Some tests (get_fs_type() is one) requires putting the module
@@ -108,7 +112,7 @@ struct kmod_test_device_info {
  * @dev: pointer to misc_dev's own struct device
  * @config_mutex: protects configuration of test
  * @trigger_mutex: the test trigger can only be fired once at a time
- * @thread_lock: protects @done count, and the @info per each thread
+ * @thread_mutex: protects @done count, and the @info per each thread
  * @done: number of threads which have completed or failed
  * @test_is_oom: when we run out of memory, use this to halt moving forward
  * @kthreads_done: completion used to signal when all work is done