[Bugfix] Autoscan when radio off hangs player, record static

Clipzip, ClipPlus other devices may be similar
Autoscan from the main menu and the device hangs at scanning 88.1

try to record with no station set and it just records static

Change-Id: I59fe17dde80736e4fae8445c0aea7fcf5e476317

apps/menus/radio_menu.c

@@ -39,6 +39,9 @@ static int fm_recording_screen(void)
 {
     bool ret;
 
+    if (radio_get_current_frequency() == 0)
+        return 0;
+
     /* switch recording source to FMRADIO for the duration */
     int rec_source = global_settings.rec_source;
     global_settings.rec_source = AUDIO_SRC_FMRADIO;

apps/radio/presets.c

@@ -679,6 +679,17 @@ int presets_scan(void *viewports)
         struct fmstation_buf *presets = presets_get();
         if (presets == NULL)
             return 1;
+        if(get_radio_status() == FMRADIO_OFF)
+        {
+            audio_stop();
+            /* turn on radio */
+            /* This should be done before touching audio settings */
+            while (!pcm_is_initialized())
+               sleep(0);
+
+            audio_set_input_source(AUDIO_SRC_FMRADIO, SRCF_FMRADIO_PLAYING);
+        }
+
         const struct fm_region_data * const fmr =
             &fm_region_data[global_settings.fm_region];