orangefs: use ARRAY_SIZE

Using the ARRAY_SIZE macro improves the readability of the code.

Found with Coccinelle with the following semantic patch:
@r depends on (org || report)@
type T;
T[] E;
position p;
@@
(
 (sizeof(E)@p /sizeof(*E))
|
 (sizeof(E)@p /sizeof(E[...]))
|
 (sizeof(E)@p /sizeof(T))
)

Signed-off-by: Jérémy Lefaure <jeremy.lefaure@lse.epita.fr>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

fs/orangefs/orangefs-debug.h

@@ -15,8 +15,10 @@
 
 #ifdef __KERNEL__
 #include <linux/types.h>
+#include <linux/kernel.h>
 #else
 #include <stdint.h>
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 #endif
 
 #define	GOSSIP_NO_DEBUG			(__u64)0
@@ -88,6 +90,6 @@ static struct __keyword_mask_s s_kmod_keyword_mask_map[] = {
 };
 
 static const int num_kmod_keyword_mask_map = (int)
-	(sizeof(s_kmod_keyword_mask_map) / sizeof(struct __keyword_mask_s));
+	(ARRAY_SIZE(s_kmod_keyword_mask_map));
 
 #endif /* __ORANGEFS_DEBUG_H */

fs/orangefs/orangefs-utils.c

@@ -4,6 +4,7 @@
  *
  * See COPYING in top-level directory.
  */
+#include <linux/kernel.h>
 #include "protocol.h"
 #include "orangefs-kernel.h"
 #include "orangefs-dev-proto.h"
@@ -606,7 +607,7 @@ int orangefs_normalize_to_errno(__s32 error_code)
 	/* Convert ORANGEFS encoded errno values into regular errno values. */
 	} else if ((-error_code) & ORANGEFS_ERROR_BIT) {
 		i = (-error_code) & ~(ORANGEFS_ERROR_BIT|ORANGEFS_ERROR_CLASS_BITS);
-		if (i < sizeof(PINT_errno_mapping)/sizeof(*PINT_errno_mapping))
+		if (i < ARRAY_SIZE(PINT_errno_mapping))
 			error_code = -PINT_errno_mapping[i];
 		else
 			error_code = -EINVAL;