Avoid size_t to (u)int warnings with auto, where it is possible

Change-Id: I1ec7454ebce59d99bc828bfd5086907eb0905632
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/utf8string.h

@@ -302,7 +302,7 @@ public:
         return datastream;
     }
 
-    friend uint qHash(const Utf8String &utf8String)
+    friend auto qHash(const Utf8String &utf8String)
     {
         return qHash(utf8String.byteArray);
     }