ui:preview Removed redundant variable.

src/main/java/com/owncloud/android/ui/preview/PreviewImageFragment.java

@@ -824,8 +824,7 @@ public class PreviewImageFragment extends FileFragment {
     private static int convertDpToPixel(float dp, Context context) {
         Resources resources = context.getResources();
         DisplayMetrics metrics = resources.getDisplayMetrics();
-        int px = (int) (dp * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT));
-        return px;
+        return (int) (dp * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT));
     }