simplify if statement

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/java/com/owncloud/android/ui/fragment/OCFileListFragment.java

@@ -792,14 +792,11 @@ public class OCFileListFragment extends ExtendedListFragment implements
         }
 
         // create rich workspace
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            if (menu.findItem(R.id.action_create_rich_workspace) != null) {
-                if (mFile != null) {
-                    menu.findItem(R.id.action_create_rich_workspace).setVisible(
-                        TextUtils.isEmpty(mFile.getRichWorkspace()));
-                }
-            }
-
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP
+            && menu.findItem(R.id.action_create_rich_workspace) != null
+            && mFile != null) {
+            menu.findItem(R.id.action_create_rich_workspace).setVisible(
+                TextUtils.isEmpty(mFile.getRichWorkspace()));
         }
     }