net: zd1211rw: Remove ZD_ASSERT(in_interrupt())

in_interrupt() is ill defined and does not provide what the name
suggests. The usage especially in driver code is deprecated and
a tree wide effort to clean up and consolidate the (ab)usage of
in_interrupt() and related checks is happening.

handle_regs_int() is always invoked as part of URB callback which is either
invoked from hard or soft interrupt context.

Remove the magic assertion.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wireless/zydas/zd1211rw/zd_usb.c

@@ -378,7 +378,6 @@ static inline void handle_regs_int(struct urb *urb)
 	int len;
 	u16 int_num;
 
-	ZD_ASSERT(in_interrupt());
 	spin_lock_irqsave(&intr->lock, flags);
 
 	int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));