smsc: replace WARN_ON() with WARN_ON_SMP()

spin_is_locked() always return false in uniprocessor configuration and therefore it
would be advise to repalce with WARN_ON_SMP().
Signed-off-by: NSanjeev Sharma <Sanjeev_Sharma@mentor.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/smsc/smsc911x.h

@@ -51,7 +51,7 @@
 
 #ifdef CONFIG_DEBUG_SPINLOCK
 #define SMSC_ASSERT_MAC_LOCK(pdata) \
-		WARN_ON(!spin_is_locked(&pdata->mac_lock))
+		WARN_ON_SMP(!spin_is_locked(&pdata->mac_lock))
 #else
 #define SMSC_ASSERT_MAC_LOCK(pdata) do {} while (0)
 #endif				/* CONFIG_DEBUG_SPINLOCK */