Bug 793880 - Fix the assertion in nsCSSSelector::SetPseudoType to shut up the compiler warning; r=dholbert

--HG--
extra : rebase_source : 058dcc17c37915fa9937f7eafb1b3a93b78384f2

layout/style/StyleRule.h

@@ -183,7 +183,9 @@ public:
     return static_cast<nsCSSPseudoElements::Type>(mPseudoType);
   }
   void SetPseudoType(nsCSSPseudoElements::Type aType) {
-    NS_ASSERTION(aType > INT16_MIN && aType < INT16_MAX, "Out of bounds");
+    NS_ASSERTION(static_cast<int32_t>(aType) >= INT16_MIN &&
+                 static_cast<int32_t>(aType) <= INT16_MAX,
+                 "Out of bounds - this will overflow mPseudoType");
     mPseudoType = static_cast<int16_t>(aType);
   }