Fix MSVC warnings about scopes.

qddshandler.cpp(483) : warning C4258: 'i' : definition from the for loop is ignored; the definition from the enclosing scope is used
        qddshandler.cpp(477) : definition of 'i' ignored
        qddshandler.cpp(467) : definition of 'i' used
qddshandler.cpp(486) : warning C4258: 'i' : definition from the for loop is ignored; the definition from the enclosing scope is used
        qddshandler.cpp(477) : definition of 'i' ignored
        qddshandler.cpp(467) : definition of 'i' used

Change-Id: Ib911578900f012db20d9e50bdffa5d1ca9896a7e
Reviewed-by: Ivan Komissarov <ABBAPOH@me.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

src/plugins/imageformats/dds/qddshandler.cpp

@@ -474,9 +474,9 @@ static QImage readATI2(QDataStream &s, quint32 width, quint32 height)
             QRgb arr[16];
             memset(arr, 0, sizeof(QRgb) * 16);
             setAlphaDXT<Five>(arr, alpha1);
-            for (int i = 0; i < 16; ++i) {
-                quint8 a = qAlpha(arr[i]);
-                arr[i] = qRgba(0, 0, a, 0);
+            for (int k = 0; k < 16; ++k) {
+                quint8 a = qAlpha(arr[k]);
+                arr[k] = qRgba(0, 0, a, 0);
             }
             setAlphaDXT<Five>(arr, alpha2);