pnp: fix the fcpnp_driver declaration to only exist if CONFIG_PNP=y

Fix the fcpnp_driver declaration to only exist if CONFIG_PNP=y as it's
only accessed in that case.

The PNP=n variant was added by 30d55e71
("hisax: depend on CONFIG_PNP, not __ISAPNP__")

Fixes an unused variable warning.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/isdn/hisax/hisax_fcpcipnp.c

@@ -974,8 +974,6 @@ static struct pnp_driver fcpnp_driver = {
 	.remove		= __devexit_p(fcpnp_remove),
 	.id_table	= fcpnp_ids,
 };
-#else
-static struct pnp_driver fcpnp_driver;
 #endif
 
 static void __devexit fcpci_remove(struct pci_dev *pdev)