The num_free field of mlx4_buddy has a type of array of unsigned int
while it was allocated as an array of pointers. On 64-bit platforms
this allocates twice more than required. Fix this by allocating the
correct size for the type.
Signed-off-by: Eli Cohen <eli@mellanox.co.il>
[ Convert to kcalloc(). - Roland ]
Signed-off-by: Roland Dreier <roland@purestorage.com>