RDMA/srpt: Use kmem_cache_free() instead of kfree()

memory allocated by kmem_cache_alloc() should be freed using
kmem_cache_free(), not kfree().

Fixes: 5dabcd0456 ("RDMA/srpt: Add support for immediate data")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -674,7 +674,7 @@ static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
 	return ioctx;
 
 err_free_buf:
-	kfree(ioctx->buf);
+	kmem_cache_free(buf_cache, ioctx->buf);
 err_free_ioctx:
 	kfree(ioctx);
 err: