fix some warnings (unused imports), remove dead code
diff --git a/src/org/sflphone/fragments/SecurityAccountFragment.java b/src/org/sflphone/fragments/SecurityAccountFragment.java
index 90c8f8d..f4bbb0d 100644
--- a/src/org/sflphone/fragments/SecurityAccountFragment.java
+++ b/src/org/sflphone/fragments/SecurityAccountFragment.java
@@ -16,6 +16,7 @@
 
 public class SecurityAccountFragment extends PreferenceFragment {
 
+    @SuppressWarnings("unused")
     private static final String TAG = SecurityAccountFragment.class.getSimpleName();
 
     private Callbacks mCallbacks = sDummyCallbacks;