Return a valid channel map when channel count is 0 for device configs.

mini_al.h

@@ -16547,15 +16547,19 @@ mal_device_config mal_device_config_init_ex(mal_format format, mal_uint32 channe
     config.onRecvCallback = onRecvCallback;
     config.onSendCallback = onSendCallback;
 
+    if (channels > 0) {
         if (channelMap == NULL) {
             if (channels > 8) {
-            mal_zero_memory(channelMap, sizeof(mal_channel)*MAL_MAX_CHANNELS);
+                mal_zero_memory(config.channelMap, sizeof(mal_channel)*MAL_MAX_CHANNELS);
             } else {
                 mal_get_standard_channel_map(mal_standard_channel_map_default, channels, config.channelMap);
             }
         } else {
             mal_copy_memory(config.channelMap, channelMap, sizeof(config.channelMap));
         }
+    } else {
+        mal_zero_memory(config.channelMap, sizeof(mal_channel)*MAL_MAX_CHANNELS);
+    }
 
     return config;
 }