[MIPS] SB1250: Fix bugs/warnings by creative use of volatile.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/drivers/net/sb1250-mac.c b/drivers/net/sb1250-mac.c
index 1eae16b..103c317 100644
--- a/drivers/net/sb1250-mac.c
+++ b/drivers/net/sb1250-mac.c
@@ -243,7 +243,7 @@
 	 * Controller-specific things
 	 */
 
-	volatile void __iomem *sbm_base;          /* MAC's base address */
+	void __iomem		*sbm_base;          /* MAC's base address */
 	sbmac_state_t    sbm_state;         /* current state */
 
 	volatile void __iomem	*sbm_macenable;	/* MAC Enable Register */