pipe: when using playback, don't require wireless adapter

Author: itsmattkc

pipe/linux/main.c

@@ -84,7 +84,7 @@ int main(int argc, const char **argv)
         return 1;
     }
 
-    if (!wireless_interface) {
+    if (!wireless_interface && !playback_file) {
         nlprint("Must identify a wireless interface to use");
         return 1;
     }

pipe/linux/wpa.c

@@ -983,6 +983,8 @@ void *do_playback(void *data)
 	int64_t timestamp;
 	char buffer[4096];
 
+	nlprint("PLAYBACK STARTED");
+
 	while (!is_interrupted()) {
 		if (!waiting) {
 			// Read next timestamp