ath5k: drop duplicate header vmalloc.h

Drop duplicate header vmalloc.h from ath5k/debug.c.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath5k/debug.c

@@ -66,7 +66,6 @@
 
 #include <linux/seq_file.h>
 #include <linux/list.h>
-#include <linux/vmalloc.h>
 #include "debug.h"
 #include "ath5k.h"
 #include "reg.h"