Staging: dgap: Remove unnecessary test expression

struct bd is already NULL tested so, any further NULL checks should be
removed.

Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgap/dgap.c

@@ -2059,7 +2059,7 @@ static void dgap_poll_tasklet(unsigned long data)
 		/*
 		 * If board is doing interrupts, ACK the interrupt.
 		 */
-		if (bd && bd->intr_running)
+		if (bd->intr_running)
 			readb(bd->re_map_port + 2);
 
 		spin_unlock_irqrestore(&bd->bd_lock, lock_flags);