input_stream: added input_stream_global_finish()

The hook input_stream_global_finish() deinitializes global structures
of all input stream implementations.

src/inputStream.c

@@ -29,6 +29,10 @@ void initInputStream(void)
 	inputStream_initHttp();
 }
 
+void input_stream_global_finish(void)
+{
+}
+
 int openInputStream(struct input_stream *inStream, char *url)
 {
 	inStream->ready = 0;

src/inputStream.h

@@ -47,6 +47,8 @@ struct input_stream {
 
 void initInputStream(void);
 
+void input_stream_global_finish(void);
+
 int isUrlSaneForInputStream(char *url);
 
 /* if an error occurs for these 3 functions, then -1 is returned and errno

src/main.c

@@ -475,6 +475,7 @@ int main(int argc, char *argv[])
 
 	deinit_main_notify();
 
+	input_stream_global_finish();
 	finishNormalization();
 	finishAudioDriver();
 	finishAudioConfig();