liquidio: make the spinlock octeon_devices_lock static

octeon_devices_lock can be made static as it does not need to be
in global scope.

Cleans up sparse warning: "warning: symbol 'octeon_devices_lock'
was not declared. Should it be static?"
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/octeon_device.c

@@ -547,7 +547,7 @@ static atomic_t adapter_refcounts[MAX_OCTEON_DEVICES];
 
 static u32 octeon_device_count;
 /* locks device array (i.e. octeon_device[]) */
-spinlock_t octeon_devices_lock;
+static spinlock_t octeon_devices_lock;
 
 static struct octeon_core_setup core_setup[MAX_OCTEON_DEVICES];