KVM: x86/mmu: Drop new_spte local variable from restore_acc_track_spte()

The new_spte local variable is unnecessary. Deleting it can save a line
of code and simplify the remaining lines a bit.

No functional change intended.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20220119230739.2234394-10-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

@@ -648,16 +648,15 @@ static u64 mmu_spte_get_lockless(u64 *sptep)
 /* Restore an acc-track PTE back to a regular PTE */
 static u64 restore_acc_track_spte(u64 spte)
 {
-	u64 new_spte = spte;
 	u64 saved_bits = (spte >> SHADOW_ACC_TRACK_SAVED_BITS_SHIFT)
 			 & SHADOW_ACC_TRACK_SAVED_BITS_MASK;
 
-	new_spte &= ~shadow_acc_track_mask;
-	new_spte &= ~(SHADOW_ACC_TRACK_SAVED_BITS_MASK <<
+	spte &= ~shadow_acc_track_mask;
+	spte &= ~(SHADOW_ACC_TRACK_SAVED_BITS_MASK <<
 		  SHADOW_ACC_TRACK_SAVED_BITS_SHIFT);
-	new_spte |= saved_bits;
+	spte |= saved_bits;
 
-	return new_spte;
+	return spte;
 }
 
 /* Returns the Accessed status of the PTE and resets it at the same time. */