IB/mlx5: 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: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/odp.c

@@ -32,6 +32,7 @@
 
 #include <rdma/ib_umem.h>
 #include <rdma/ib_umem_odp.h>
+#include <linux/kernel.h>
 
 #include "mlx5_ib.h"
 #include "cmd.h"
@@ -929,8 +930,7 @@ static int mlx5_ib_mr_initiator_pfault_handler(
 		return -EFAULT;
 	}
 
-	if (unlikely(opcode >= sizeof(mlx5_ib_odp_opcode_cap) /
-	    sizeof(mlx5_ib_odp_opcode_cap[0]) ||
+	if (unlikely(opcode >= ARRAY_SIZE(mlx5_ib_odp_opcode_cap) ||
 		     !(transport_caps & mlx5_ib_odp_opcode_cap[opcode]))) {
 		mlx5_ib_err(dev, "ODP fault on QP of an unsupported opcode 0x%x\n",
 			    opcode);