KVM: x86/i8259: Remove a dead store of irq in a conditional block

The [clang-analyzer-deadcode.DeadStores] helper reports
that the value stored to 'irq' is never read.
Signed-off-by: NLike Xu <likexu@tencent.com>
Message-Id: <20220301120217.38092-1-likexu@tencent.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/i8259.c

@@ -252,7 +252,6 @@ int kvm_pic_read_irq(struct kvm *kvm)
 				 */
 				irq2 = 7;
 			intno = s->pics[1].irq_base + irq2;
-			irq = irq2 + 8;
 		} else
 			intno = s->pics[0].irq_base + irq;
 	} else {