tty: serial: jsm: constify pci_device_id.

pci_device_id are not supposed to change at runtime. All functions
working with pci_device_id provided by <linux/pci.h> work with
const pci_device_id. So mark the non-const structs as const.

File size before:
text data bss dec hex filename
2442 1088 8 3538 dd2 tty/serial/jsm/jsm_driver.o

File size After adding 'const':
text data bss dec hex filename
3082 448 8 3538 dd2 tty/serial/jsm/jsm_driver.o

Signed-off-by: Arvind Yadav <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/jsm/jsm_driver.c

···
 	kfree(brd);
 }
 
-static struct pci_device_id jsm_pci_tbl[] = {
+static const struct pci_device_id jsm_pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
 	{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
 	{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },