MIPS: MSP71xx: Fix build error

When CONFIG_MIPS_MT_SMP is enabled, the following compilation error
occurs:

arch/mips/pmcs-msp71xx/msp_irq_cic.c:134: error: ‘irq’ undeclared

This code clearly never saw a compiler.
The surrounding code suggests, that 'd->irq' was intended, not
'irq'.

This error was found with vampyr.

Signed-off-by: Stefan Hengelein <stefan.hengelein@fau.de>
Fixes: d7881fbdf866d7d0 ("MIPS: msp71xx: Convert to new irq_chip functions")
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8116/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/pmcs-msp71xx/msp_irq_cic.c

@@ -131,11 +131,11 @@ static int msp_cic_irq_set_affinity(struct irq_data *d,
 	int cpu;
 	unsigned long flags;
 	unsigned int  mtflags;
-	unsigned long imask = (1 << (irq - MSP_CIC_INTBASE));
+	unsigned long imask = (1 << (d->irq - MSP_CIC_INTBASE));
 	volatile u32 *cic_mask = (volatile u32 *)CIC_VPE0_MSK_REG;
 
 	/* timer balancing should be disabled in kernel code */
-	BUG_ON(irq == MSP_INT_VPE0_TIMER || irq == MSP_INT_VPE1_TIMER);
+	BUG_ON(d->irq == MSP_INT_VPE0_TIMER || d->irq == MSP_INT_VPE1_TIMER);
 
 	LOCK_CORE(flags, mtflags);
 	/* enable if any of each VPE's TCs require this IRQ */