KVM: PPC: e500: Fix build error due to using kmalloc_obj() with wrong type

Fix a build error in kvmppc_e500_tlb_init() that was introduced by the
conversion to use kzalloc_objs(), as KVM confusingly uses the size of the
structure that is one and only field in tlbe_priv:

  arch/powerpc/kvm/e500_mmu.c:923:33: error: assignment to 'struct tlbe_priv *'
    from incompatible pointer type 'struct tlbe_ref *' [-Wincompatible-pointer-types]
  923 |         vcpu_e500->gtlb_priv[0] = kzalloc_objs(struct tlbe_ref,
      |                                 ^

KVM has been flawed since commit 0164c0f ("KVM: PPC: e500: clear up
confusion between host and guest entries"), but the issue went unnoticed
until kmalloc_obj() came along and enforced types, as "struct tlbe_priv"
was just a wrapper of "struct tlbe_ref" (why on earth the two ever existed
separately...).

Fixes: 69050f8 ("treewide: Replace kmalloc with kmalloc_obj for non-scalar types")
Cc: Kees Cook <kees@kernel.org>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Link: https://patch.msgid.link/20260303190339.974325-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: sean-jc

arch/powerpc/kvm/e500_mmu.c

@@ -920,12 +920,12 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
 	vcpu_e500->gtlb_offset[0] = 0;
 	vcpu_e500->gtlb_offset[1] = KVM_E500_TLB0_SIZE;
 
-	vcpu_e500->gtlb_priv[0] = kzalloc_objs(struct tlbe_ref,
+	vcpu_e500->gtlb_priv[0] = kzalloc_objs(struct tlbe_priv,
 					       vcpu_e500->gtlb_params[0].entries);
 	if (!vcpu_e500->gtlb_priv[0])
 		goto free_vcpu;
 
-	vcpu_e500->gtlb_priv[1] = kzalloc_objs(struct tlbe_ref,
+	vcpu_e500->gtlb_priv[1] = kzalloc_objs(struct tlbe_priv,
 					       vcpu_e500->gtlb_params[1].entries);
 	if (!vcpu_e500->gtlb_priv[1])
 		goto free_vcpu;