Remove duplicating code

Using function instead of rewriting the same code

zasm/src/zasm/src/core/error.cpp

@@ -16,7 +16,7 @@ namespace zasm
     // we have to use a different approach.
     static ErrorExt* toErrorExt(std::uint64_t data) noexcept
     {
-        assert((data & kErrorExtBit) != 0);
+        assert(isExtError(data));
 
         auto* ext = reinterpret_cast<ErrorExt*>(data & ~kErrorExtBit);
         return ext;