MIPS: SGI-IP27: Fix use of unchecked pointer in shutdown_bridge_irq

smatch complaint:

    arch/mips/sgi-ip27/ip27-irq.c:123 shutdown_bridge_irq()
    warn: variable dereferenced before check 'hd' (see line 121)

Fix it by removing local variable and use hd->pin directly.

Fixes: 69a07a4 ("MIPS: SGI-IP27: rework HUB interrupts")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

arch/mips/sgi-ip27/ip27-irq.c

@@ -118,15 +118,14 @@ static void shutdown_bridge_irq(struct irq_data *d)
 {
 	struct hub_irq_data *hd = irq_data_get_irq_chip_data(d);
 	struct bridge_controller *bc;
-	int pin = hd->pin;
 
 	if (!hd)
 		return;
 
 	disable_hub_irq(d);
 
 	bc = hd->bc;
-	bridge_clr(bc, b_int_enable, (1 << pin));
+	bridge_clr(bc, b_int_enable, (1 << hd->pin));
 	bridge_read(bc, b_wid_tflush);
 }