KVM: SVM: Drop explicit check on MSRPM offset when emulating SEV-ES accesses

Now that msr_write_intercepted() defaults to true, i.e. accurately reflects
hardware behavior for out-of-range MSRs, and doesn't WARN (or BUG) on an
out-of-range MSR, drop sev_es_prevent_msr_access()'s svm_msrpm_offset()
check that guarded against calling msr_write_intercepted() with a "bad"
index.

Opportunistically clean up the helper's formatting.

Link: https://lore.kernel.org/r/20250610225737.156318-25-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

arch/x86/kvm/svm/svm.c

@@ -2754,12 +2754,11 @@ static int svm_get_feature_msr(u32 msr, u64 *data)
 	return 0;
 }
 
-static bool
-sev_es_prevent_msr_access(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
+static bool sev_es_prevent_msr_access(struct kvm_vcpu *vcpu,
+				      struct msr_data *msr_info)
 {
 	return sev_es_guest(vcpu->kvm) &&
 	       vcpu->arch.guest_state_protected &&
-	       svm_msrpm_offset(msr_info->index) != MSR_INVALID &&
 	       !msr_write_intercepted(vcpu, msr_info->index);
 }