ath11k: fix undefined reference to 'ath11k_debugfs_htt_ext_stats_handler'

kbuild bot reported than link fails when CONFIG_ATH11K_DEBUGFS is disabled:

drivers/net/wireless/ath/ath11k/dp_rx.c:1662: undefined reference to `ath11k_debugfs_htt_ext_stats_handler'

This was because I had missed to move the static inline version of the function
(which are used when CONFIG_ATH11K_DEBUGFS is disabled) to debufs_htt_stats.h.
Also move ath11k_debugfs_htt_stats_req() at the same time. And create a stub
also for ath11k_debugfs_htt_stats_init() for consistency, even if it's not
needed.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 568f060 ("ath11k: debugfs: move some function declarations to correct header files")
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1601024241-16594-1-git-send-email-kvalo@codeaurora.org

Author: Kalle Valo

drivers/net/wireless/ath/ath11k/debugfs.h

@@ -173,11 +173,6 @@ static inline void ath11k_debugfs_unregister(struct ath11k *ar)
 {
 }
 
-static inline void ath11k_dbg_htt_ext_stats_handler(struct ath11k_base *ab,
-						    struct sk_buff *skb)
-{
-}
-
 static inline void ath11k_debugfs_fw_stats_process(struct ath11k_base *ab,
 						   struct sk_buff *skb)
 {
@@ -197,11 +192,6 @@ static inline int ath11k_debugfs_is_extd_rx_stats_enabled(struct ath11k *ar)
 	return 0;
 }
 
-static inline int ath11k_debugfs_htt_stats_req(struct ath11k *ar)
-{
-	return 0;
-}
-
 static inline bool ath11k_debugfs_is_pktlog_lite_mode_enabled(struct ath11k *ar)
 {
 	return false;

drivers/net/wireless/ath/ath11k/debugfs_htt_stats.h

@@ -1685,9 +1685,29 @@ struct htt_ring_backpressure_stats_tlv {
 	u32 backpressure_hist[5];
 };
 
+#ifdef CONFIG_ATH11K_DEBUGFS
+
 void ath11k_debugfs_htt_stats_init(struct ath11k *ar);
 void ath11k_debugfs_htt_ext_stats_handler(struct ath11k_base *ab,
 					  struct sk_buff *skb);
 int ath11k_debugfs_htt_stats_req(struct ath11k *ar);
 
+#else /* CONFIG_ATH11K_DEBUGFS */
+
+static inline void ath11k_debugfs_htt_stats_init(struct ath11k *ar)
+{
+}
+
+static inline void ath11k_debugfs_htt_ext_stats_handler(struct ath11k_base *ab,
+							struct sk_buff *skb)
+{
+}
+
+static inline int ath11k_debugfs_htt_stats_req(struct ath11k *ar)
+{
+	return 0;
+}
+
+#endif /* CONFIG_ATH11K_DEBUGFS */
+
 #endif