Correct minor spelling errors

src/ui/notifier.c

@@ -140,7 +140,7 @@ notify_subscription(const char *const from)
 {
     GString *message = g_string_new("Subscription request: \n");
     g_string_append(message, from);
-    notify(message->str, 10000, "Incomming message");
+    notify(message->str, 10000, "Incoming message");
     g_string_free(message, TRUE);
 }