Staging: vt6656: use ARRAY_SIZE macro in channel.c

Replace (sizeof(ChannelRuleTab) / sizeof(ChannelRuleTab[0])) with
ARRAY_SIZE(ChannelRuleTab) in drivers/staging/vt6656/channel.c

Signed-off-by: Nikitas Angelinas <nikitasangelinas@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/vt6656/channel.c

@@ -34,6 +34,7 @@
  *
  */
 
+#include <linux/kernel.h>
 #include "country.h"
 #include "channel.h"
 #include "rf.h"
@@ -367,7 +368,7 @@ static  struct
 /*                                           1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  */
 };
 
-#define NUM_RULES	(sizeof(ChannelRuleTab) / sizeof(ChannelRuleTab[0]))
+#define NUM_RULES	ARRAY_SIZE(ChannelRuleTab)
 
 /*---------------------  Export function  -------------------------*/
 /************************************************************************