KVM: powerpc: Fix BUILD_BUG_ON condition

The old BUILD_BUG_ON implementation didn't work with __builtin_constant_p().
Fixing that revealed this test had been inverted for a long time without
anybody noticing...

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/powerpc/kvm/timing.h b/arch/powerpc/kvm/timing.h
index 806ef67..8167d42 100644
--- a/arch/powerpc/kvm/timing.h
+++ b/arch/powerpc/kvm/timing.h
@@ -51,7 +51,7 @@
 
 	/* The BUILD_BUG_ON below breaks in funny ways, commented out
 	 * for now ... -BenH
-	BUILD_BUG_ON(__builtin_constant_p(type));
+	BUILD_BUG_ON(!__builtin_constant_p(type));
 	*/
 	switch (type) {
 	case EXT_INTR_EXITS: