Fix warnings

TouchGFX/gui/include/gui/containers/TireTemp.hpp

@@ -15,7 +15,7 @@ public:
 
 protected:
 private:
-  unsigned temp;
+  int temp;
   Unicode::UnicodeChar valueBuffer[3];
 
   void updateValueBuffer();

TouchGFX/gui/src/containers/TireTemp.cpp

@@ -36,7 +36,7 @@ void TireTemp::setTemp(int temp_in_celsius) {
 void TireTemp::updateValueBuffer() {
   //   Unicode::utoa(temp, valueBuffer, 3, 10);
   Unicode::snprintf(valueBuffer,
-                    sizeof(valueBuffer) / sizeof(Unicode::UnicodeChar), "%02u",
+                    sizeof(valueBuffer) / sizeof(Unicode::UnicodeChar), "%02d",
                     temp);
   value.setWildcard(valueBuffer);
 }