[libunwind] fix a typo in r321441.

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@321442 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/DwarfParser.hpp b/src/DwarfParser.hpp
index 47f7957..518101e 100644
--- a/src/DwarfParser.hpp
+++ b/src/DwarfParser.hpp
@@ -549,7 +549,7 @@
     case DW_CFA_expression:
       reg = addressSpace.getULEB128(p, instructionsEnd);
       if (reg > kMaxRegisterNumber) {
-        _LIBUNWIND_LOG(
+        _LIBUNWIND_LOG0(
                 "malformed DW_CFA_expression DWARF unwind, reg too big");
         return false;
       }