Fix period initialization

Signed-off-by: malc <av1474@comtv.ru>
diff --git a/audio/audio.c b/audio/audio.c
index f4eca6e..694a83e 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -84,7 +84,7 @@
         }
     },
 
-    .period = { .ticks = 250 },
+    .period = { .hertz = 250 },
     .plive = 0,
     .log_to_monitor = 0,
 };