ALSA: aloop: Drop unnecessary ifdef CONFIG_PROC_FS

Since the compiler can optimize away the unused code, we can reduce
the messy ifdef.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/drivers/aloop.c

@@ -1053,8 +1053,6 @@ static int loopback_mixer_new(struct loopback *loopback, int notify)
 	return 0;
 }
 
-#ifdef CONFIG_PROC_FS
-
 static void print_dpcm_info(struct snd_info_buffer *buffer,
 			    struct loopback_pcm *dpcm,
 			    const char *id)
@@ -1128,12 +1126,6 @@ static int loopback_proc_new(struct loopback *loopback, int cidx)
 	return 0;
 }
 
-#else /* !CONFIG_PROC_FS */
-
-#define loopback_proc_new(loopback, cidx) do { } while (0)
-
-#endif
-
 static int loopback_probe(struct platform_device *devptr)
 {
 	struct snd_card *card;