Remove unnecessary variable initializations

F-Droid/src/org/fdroid/fdroid/RepoUpdater.java

@@ -293,7 +293,7 @@ public class RepoUpdater {
          * fingerprint.  In that case, check that fingerprint against what is
          * actually in the index.jar itself.  If no fingerprint, just store the
          * signing certificate */
-        boolean trustNewSigningCertificate = false;
+        boolean trustNewSigningCertificate;
         // If the fingerprint has never been set, it will be null (never "" or something else)
         if (repo.fingerprint == null) {
             // no info to check things are valid, so just Trust On First Use

F-Droid/src/org/fdroid/fdroid/views/fragments/PreferencesFragment.java

@@ -209,7 +209,7 @@ public class PreferencesFragment extends PreferenceFragment
                         AlertDialog.Builder alertBuilder = new AlertDialog.Builder(getActivity());
                         alertBuilder.setTitle(R.string.system_install_denied_title);
 
-                        String message = null;
+                        String message;
                         switch (isInstalledCorrectly) {
                             case PrivilegedInstaller.IS_EXTENSION_INSTALLED_NO:
                                 message = getActivity().getString(R.string.system_install_denied_body) +