fix CONFIG_SATA_SIS=y compile error

Static code shouldn't be used from other modules.

drivers/built-in.o: In function `sis_init_one':
sata_sis.c:(.text+0x7634cd): undefined reference to `sis_info133'
sata_sis.c:(.text+0x7634d6): undefined reference to `sis_info133'

While I was at it, I also moved the prototype of this struct to a header
file.

Signed-off-by: Adrian Bunk <[e-mail]>
Cc: Jeff Garzik <[e-mail]>
Cc: Tejun Heo <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/ata/libata.h

···
 /* libata-sff.c */
 extern u8 ata_irq_on(struct ata_port *ap);
 
+/* pata_sis.c */
+extern struct ata_port_info sis_info133;
+
 #endif /* __LIBATA_H__ */

drivers/ata/pata_sis.c

···
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>
 #include <linux/ata.h>
+#include "libata.h"
 
 #define DRV_NAME	"pata_sis"
 #define DRV_VERSION	"0.4.5"
···
 	.pio_mask	= 0x1f,	/* pio0-4 */
 	.port_ops	= &sis_66_ops,
 };
-static struct ata_port_info sis_info133 = {
+struct ata_port_info sis_info133 = {
 	.sht		= &sis_sht,
 	.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 	.pio_mask	= 0x1f,	/* pio0-4 */

drivers/ata/sata_sis.c

···
 #include <linux/device.h>
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>
+#include "libata.h"
 
 #define DRV_NAME	"sata_sis"
 #define DRV_VERSION	"0.7"
···
 
 static int sis_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 {
-	/* Provided by the PATA driver */
-	extern struct ata_port_info sis_info133;
-
 	static int printed_version;
 	struct ata_probe_ent *probe_ent = NULL;
 	int rc;