Replace NR_VMX_MSR with its definition

Using ARRAY_SIZE directly makes it easier to read the code.  While touching
the code, replace the division by a multiplication in the recently added
BUILD_BUG_ON.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3397a88..a3845b8 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -823,7 +823,6 @@
 #endif
 	MSR_EFER, MSR_TSC_AUX, MSR_STAR,
 };
-#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
 
 static inline bool is_page_fault(u32 intr_info)
 {
@@ -4441,7 +4440,7 @@
 		vmx->vcpu.arch.pat = host_pat;
 	}
 
-	for (i = 0; i < NR_VMX_MSR; ++i) {
+	for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) {
 		u32 index = vmx_msr_index[i];
 		u32 data_low, data_high;
 		int j = vmx->nmsrs;
@@ -7608,7 +7607,8 @@
 		goto free_vcpu;
 
 	vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	BUILD_BUG_ON(PAGE_SIZE / sizeof(struct shared_msr_entry) < NR_VMX_MSR);
+	BUILD_BUG_ON(ARRAY_SIZE(vmx_msr_index) * sizeof(vmx->guest_msrs[0])
+		     > PAGE_SIZE);
 
 	err = -ENOMEM;
 	if (!vmx->guest_msrs) {
@@ -8960,7 +8960,7 @@
 
 	rdmsrl_safe(MSR_EFER, &host_efer);
 
-	for (i = 0; i < NR_VMX_MSR; ++i)
+	for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i)
 		kvm_define_shared_msr(i, vmx_msr_index[i]);
 
 	vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);