KVM: x86/mmu: Clean up make_huge_page_split_spte() definition and intro

Tweak the definition of make_huge_page_split_spte() to eliminate an
unnecessarily long line, and opportunistically initialize child_spte to
make it more obvious that the child is directly derived from the huge
parent.

No functional change intended.

Signed-off-by: Sean Christopherson <[e-mail]>
Message-ID: <[e-mail]>
Signed-off-by: Paolo Bonzini <[e-mail]>

arch/x86/kvm/mmu/spte.c

···
  * This is used during huge page splitting to build the SPTEs that make up the
  * new page table.
  */
-u64 make_huge_page_split_spte(struct kvm *kvm, u64 huge_spte, union kvm_mmu_page_role role,
-			      int index)
+u64 make_huge_page_split_spte(struct kvm *kvm, u64 huge_spte,
+			      union kvm_mmu_page_role role, int index)
 {
-	u64 child_spte;
+	u64 child_spte = huge_spte;
 
 	KVM_BUG_ON(!is_shadow_present_pte(huge_spte) || !is_large_pte(huge_spte), kvm);
-
-	child_spte = huge_spte;
 
 	/*
 	 * The child_spte already has the base address of the huge page being