goldfish_pipe: make tasklet goldfish_interrupt_tasklet static

Tasklet goldfish_interrupt_tasklet is local to the source and
does not need to be in global scope, so make it static.

Cleans up sparse warning:
symbol 'goldfish_interrupt_tasklet' was not declared. Should it be static?
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/platform/goldfish/goldfish_pipe.c

@@ -645,7 +645,7 @@ static void goldfish_interrupt_task(unsigned long unused)
 		wake_up_interruptible(&pipe->wake_queue);
 	}
 }
-DECLARE_TASKLET(goldfish_interrupt_tasklet, goldfish_interrupt_task, 0);
+static DECLARE_TASKLET(goldfish_interrupt_tasklet, goldfish_interrupt_task, 0);
 
 /*
  * The general idea of the interrupt handling: