sound/core/memalloc.c: fix PROC_FS=n compilation

This patch fixes the following compile error with CONFIG_PROC_FS=n:

<-- snip -->

...
CC sound/core/memalloc.o
sound/core/memalloc.c: In function 'snd_mem_exit':
sound/core/memalloc.c:657: error: 'snd_mem_proc' undeclared (first use in this function) sound/core/memalloc.c:657: error: (Each undeclared identifier is reported only once sound/core/memalloc.c:657: error: for each function it appears in.) make[2]: *** [sound/core/memalloc.o] Error 1

<-- snip -->

Since snd_mem_proc was needlessly global, I've also made it static.

@@ -505,13 +505,13 @@
 	up(&list_mutex);
 }
 
+static struct proc_dir_entry *snd_mem_proc;
 
 #ifdef CONFIG_PROC_FS
 /*
  * proc file interface
  */
 #define SND_MEM_PROC_FILE	"driver/snd-page-alloc"
-struct proc_dir_entry *snd_mem_proc;
 
 static int snd_mem_proc_read(char *page, char **start, off_t off,
 			     int count, int *eof, void *data)

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