alsamixer: Fix X-win related crash for PulseAudio plugin (bad linking)

A lot of reports that alsamixer crashes in X terminal when the PulseAudio
CTL plugin is activated were entered to the tracking systems.

I figured that there is a linking clash for the shutdown() function.
The shutdown() function in glibc is socket related, but the alsamixer code
redefines this function and appearently that under some linking
circumstances - which PA client invokes during the runtime dynamic linking
- the wrong function is called.

This patch, for safety, renames the shutdown() function from alsamixer
to app_shutdown(), but it might make sense to figure the real linking
culprit to avoid future surprises.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

alsamixer/cli.c

@@ -130,6 +130,6 @@ int main(int argc, char *argv[])
 
 	mainloop();
 
-	shutdown();
+	app_shutdown();
 	return 0;
 }

alsamixer/die.c

@@ -26,14 +26,14 @@
 
 void fatal_error(const char *msg)
 {
-	shutdown();
+	app_shutdown();
 	fprintf(stderr, "%s\n", msg);
 	exit(EXIT_FAILURE);
 }
 
 void fatal_alsa_error(const char *msg, int err)
 {
-	shutdown();
+	app_shutdown();
 	fprintf(stderr, _("%s: %s\n"), msg, snd_strerror(err));
 	exit(EXIT_FAILURE);
 }

alsamixer/mainloop.c

@@ -52,7 +52,7 @@ void initialize_curses(bool use_color)
 	snd_lib_error_set_handler(black_hole_error_handler);
 }
 
-void shutdown(void)
+void app_shutdown(void)
 {
 	if (curses_initialized) {
 		clear();

alsamixer/mainloop.h

@@ -5,6 +5,6 @@
 
 void initialize_curses(bool use_color);
 void mainloop(void);
-void shutdown(void);
+void app_shutdown(void);
 
 #endif