Fix some Wnewline-eof warnings.

extras/nodes/ma_channel_separator_node/ma_channel_separator_node_example.c

@@ -145,4 +145,4 @@ done0: ma_device_uninit(&device);
     (void)argv;
 
     return 0;
-}
+}

extras/nodes/ma_ltrim_node/ma_ltrim_node_example.c

@@ -111,4 +111,4 @@ done1: ma_node_graph_uninit(&g_nodeGraph, NULL);
 done0: ma_device_uninit(&device);
 
     return 0;
-}
+}

extras/nodes/ma_reverb_node/ma_reverb_node_example.c

@@ -119,4 +119,4 @@ done0: ma_device_uninit(&device);
     (void)argv;
 
     return 0;
-}
+}