Bugfix/fix sonarcube findings (#6369)

* Fix sonarcube findings.
---------
Co-authored-by: Kim Kulling <kim.kulling@draeger.com>

code/AssetLib/Assxml/AssxmlFileWriter.cpp

@@ -77,8 +77,7 @@ static int ioprintf(IOStream *io, const char *format, ...) {
     }
 
     static const int Size = 4096;
-    char sz[Size];
-    ::memset(sz, '\0', Size);
+    char sz[Size] = {};
     va_list va;
     va_start(va, format);
     const unsigned int nSize = vsnprintf(sz, Size - 1, format, va);
@@ -350,7 +349,7 @@ static void WriteDump(const char *pFile, const char *cmd, const aiScene *scene,
             for (unsigned int n = 0; n < mat->mNumProperties; ++n) {
 
                 const aiMaterialProperty *prop = mat->mProperties[n];
-                const char *sz = "";
+                auto sz = "";
                 if (prop->mType == aiPTI_Float) {
                     sz = "float";
                 } else if (prop->mType == aiPTI_Integer) {