enable ath10k debugfs only when debugfs is enabled,
fixes an invalid pointer on module insert
--- a/drivers/net/wireless/ath/ath10k/Kconfig
+++ b/drivers/net/wireless/ath/ath10k/Kconfig
@@ -24,7 +24,7 @@ config ATH10K_DEBUG
config ATH10K_DEBUGFS
bool "Atheros ath10k debugfs support"
- depends on ATH10K
+ depends on ATH10K && DEBUG_FS
select RELAY
---help---
Enabled debugfs support