fix error check in assert

llvm-svn: 154971
diff --git a/llvm/lib/Support/LocaleXlocale.inc b/llvm/lib/Support/LocaleXlocale.inc
index c3f3e4e..f595e7c 100644
--- a/llvm/lib/Support/LocaleXlocale.inc
+++ b/llvm/lib/Support/LocaleXlocale.inc
@@ -21,7 +21,7 @@
       assert(s.size()==strlen(s.c_str()));
 
       size_t size = mbstowcs_l(NULL,s.c_str(),0,l);
-      assert(size>=0);
+      assert(size!=(size_t)-1);
       if (size==0)
         return 0;
       llvm::SmallVector<wchar_t,200> ws(size);