[ALSA] make local objects static

Memalloc module,PCM Midlevel,Timer Midlevel,GUS Library,AC97 Codec
ALI5451 driver,RME9652 driver
Make some functions/variables that are used in only one file static.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index c41ec2e..0082914 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -1584,8 +1584,8 @@
 	return snd_pcm_hw_param_value(params, var, NULL);
 }
 
-int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params,
-			   snd_pcm_hw_param_t var, const snd_mask_t *val)
+static int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params,
+				  snd_pcm_hw_param_t var, const snd_mask_t *val)
 {
 	int changed;
 	assert(hw_is_mask(var));