firewire: don't use extern on public symbols

Make firewire entry points not 'extern':

drivers/firewire/fw-device.c:160:25: warning: function 'fw_device_get' with external linkage has definition
drivers/firewire/fw-device.c:167:13: warning: function 'fw_device_put' with external linkage has definition
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/fw-device.c

@@ -157,14 +157,14 @@ struct bus_type fw_bus_type = {
 };
 EXPORT_SYMBOL(fw_bus_type);
 
-extern struct fw_device *fw_device_get(struct fw_device *device)
+struct fw_device *fw_device_get(struct fw_device *device)
 {
 	get_device(&device->device);
 
 	return device;
 }
 
-extern void fw_device_put(struct fw_device *device)
+void fw_device_put(struct fw_device *device)
 {
 	put_device(&device->device);
 }