sal, android: fix -Werror,-Wreturn-type

Change-Id: Ic37967dedb2378106db2f3f437781c8ad20cad56

sal/android/libreofficekit-jni.c

@@ -143,6 +143,8 @@ jboolean libreofficekit_initialize(JNIEnv* env,
     }
 
     LOGI("LibreOfficeKit: libreofficekit_initialize finished");
+
+    return JNI_TRUE;
 }
 
 /// Initialize the LibreOfficeKit.