KVM: PPC: Book3S PR: Remove unused variable 'vcpu_book3s'

The vcpu_book3s variable is assigned but never used. So remove it.
Found using cppcheck.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kvm/book3s_64_mmu.c

@@ -377,15 +377,12 @@ no_seg_found:
 
 static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)
 {
-	struct kvmppc_vcpu_book3s *vcpu_book3s;
 	u64 esid, esid_1t;
 	int slb_nr;
 	struct kvmppc_slb *slbe;
 
 	dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb);
 
-	vcpu_book3s = to_book3s(vcpu);
-
 	esid = GET_ESID(rb);
 	esid_1t = GET_ESID_1T(rb);
 	slb_nr = rb & 0xfff;