Revert "staging: gasket: page table: hold references to device and pci_dev"

gasket_free_dev() is called only from driver PCI probe and remove
function. It is guaranteed that that pci_dev structure is not going
anywhere during that time; there is no need to take this additional
reference.

This reverts commit dd9d1502fe.

Reported-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gasket/gasket_page_table.c

@@ -280,7 +280,7 @@ int gasket_page_table_init(struct gasket_page_table **ppg_tbl,
 	pg_tbl->extended_offset_reg =
 		(u64 __iomem *)&bar_data->virt_base[page_table_config->extended_reg];
 	pg_tbl->device = get_device(device);
-	pg_tbl->pci_dev = pci_dev_get(pci_dev);
+	pg_tbl->pci_dev = pci_dev;
 
 	dev_dbg(device, "Page table initialized successfully\n");
 
@@ -378,7 +378,6 @@ void gasket_page_table_cleanup(struct gasket_page_table *pg_tbl)
 	pg_tbl->entries = NULL;
 
 	put_device(pg_tbl->device);
-	pci_dev_put(pg_tbl->pci_dev);
 	kfree(pg_tbl);
 }