RDMA/rxe: Replace obj by elem in declaration

Fix a harmless typo replacing obj by elem in the cleanup fields.  This has
no effect but is confusing.

Link: https://lore.kernel.org/r/20220304000808.225811-6-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: rpearsonhpe-design

drivers/infiniband/sw/rxe/rxe_pool.c

@@ -12,7 +12,7 @@ static const struct rxe_type_info {
 	const char *name;
 	size_t size;
 	size_t elem_offset;
-	void (*cleanup)(struct rxe_pool_elem *obj);
+	void (*cleanup)(struct rxe_pool_elem *elem);
 	enum rxe_pool_flags flags;
 	u32 min_index;
 	u32 max_index;

drivers/infiniband/sw/rxe/rxe_pool.h

@@ -39,7 +39,7 @@ struct rxe_pool {
 	struct rxe_dev		*rxe;
 	const char		*name;
 	rwlock_t		pool_lock; /* protects pool add/del/search */
-	void			(*cleanup)(struct rxe_pool_elem *obj);
+	void			(*cleanup)(struct rxe_pool_elem *elem);
 	enum rxe_pool_flags	flags;
 	enum rxe_elem_type	type;