parisc: sba: Fix compile warning wrt list of SBA devices

Fix this makecheck warning:
drivers/parisc/sba_iommu.c:98:19: warning: symbol 'sba_list'
	was not declared. Should it be static?
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/ropes.h

@@ -86,6 +86,9 @@ struct sba_device {
 	struct ioc		ioc[MAX_IOC];
 };
 
+/* list of SBA's in system, see drivers/parisc/sba_iommu.c */
+extern struct sba_device *sba_list;
+
 #define ASTRO_RUNWAY_PORT	0x582
 #define IKE_MERCED_PORT		0x803
 #define REO_MERCED_PORT		0x804

drivers/char/agp/parisc-agp.c

@@ -394,8 +394,6 @@ find_quicksilver(struct device *dev, void *data)
 static int __init
 parisc_agp_init(void)
 {
-	extern struct sba_device *sba_list;
-
 	int err = -1;
 	struct parisc_device *sba = NULL, *lba = NULL;
 	struct lba_device *lbadev = NULL;