text/ttf: fixed all memory violations.

src/loaders/ttf/tvgTtfLoader.cpp

@@ -149,7 +149,7 @@ static uint32_t* _codepoints(const char* text, size_t n)
             return nullptr;
         }
     }
-    utf32[i] = 0;   //end of the unicdoe
+    utf32[i - 1] = 0;   //end of the unicdoe
     return utf32;
 }
 

src/renderer/tvgText.h

@@ -45,6 +45,7 @@ struct Text::Impl
 
     ~Impl()
     {
+        free(utf8);
         LoaderMgr::retrieve(loader);
         delete(paint);
     }