assert that ClassSize(0) is 0 instead >=0

Because it's return value being size_t cannot be negative
anyways. This fixes clang warning

1 files changed, 1 insertions, 1 deletions

diff --git a/src/common.cc b/src/common.cc
index bd4f6ed..8269fb3 100644
--- a/src/common.cc
+++ b/src/common.cc
@@ -122,7 +122,7 @@ void SizeMap::Init() {
   InitTCMallocTransferNumObjects();
 
   // Do some sanity checking on add_amount[]/shift_amount[]/class_array[]
-  if (ClassIndex(0) < 0) {
+  if (ClassIndex(0) != 0) {
     Log(kCrash, __FILE__, __LINE__,
         "Invalid class index for size 0", ClassIndex(0));
   }