staging/lustre/libcfs: use ARRAY_SIZE instead of sizeof/sizeof[0]

use macro definition

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/libcfs/nidstrings.c

@@ -74,8 +74,7 @@ libcfs_next_nidstring(void)
 	spin_lock_irqsave(&libcfs_nidstring_lock, flags);
 
 	str = libcfs_nidstrings[libcfs_nidstring_idx++];
-	if (libcfs_nidstring_idx ==
-	    sizeof(libcfs_nidstrings)/sizeof(libcfs_nidstrings[0]))
+	if (libcfs_nidstring_idx == ARRAY_SIZE(libcfs_nidstrings))
 		libcfs_nidstring_idx = 0;
 
 	spin_unlock_irqrestore(&libcfs_nidstring_lock, flags);
@@ -198,7 +197,7 @@ static struct netstrfns  libcfs_netstrfns[] = {
 	{/* .nf_type      */  -1},
 };
 
-const int libcfs_nnetstrfns = sizeof(libcfs_netstrfns)/sizeof(libcfs_netstrfns[0]);
+const int libcfs_nnetstrfns = ARRAY_SIZE(libcfs_netstrfns);
 
 int
 libcfs_lo_str2addr(const char *str, int nob, __u32 *addr)