Lint fixes

src/demangle/demangle_with_cxxabi.cpp

@@ -18,7 +18,7 @@ namespace cpptrace {
             // demangled will always be nullptr on non-zero status, and if __cxa_demangle ever fails for any reason
             // we'll just quietly return the mangled name
             if(demangled) {
-                const std::string str = demangled;
+                std::string str = demangled;
                 // NOLINTNEXTLINE(cppcoreguidelines-no-malloc)
                 std::free(demangled);
                 return str;

src/platform/error.hpp

@@ -69,9 +69,9 @@ namespace detail {
     }
 
     template<typename T>
-    void nothing() {}
+    void nullfn() {}
 
-    #define PHONY_USE(E) (nothing<decltype(E)>())
+    #define PHONY_USE(E) (nullfn<decltype(E)>())
 
     // Check condition in both debug and release. std::runtime_error on failure.
     #define CPPTRACE_VERIFY(c, ...) ( \