[ALSA] Fix permissions in some /proc files

PCM Midlevel,CA0106 driver,EMU10K1/EMU10K2 driver
Fix by Guillaume Chazarain <guichaz@yahoo.fr>:

Some tunables in /proc have a write() function, but as their
permission does not reflect it, it can be confusing to the user.

So here is a patch that corrects the mode of those files. Note that I
have only tested the 'xrun_debug' entry.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/pcm.c

@@ -451,6 +451,7 @@ static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
 		entry->c.text.read = snd_pcm_xrun_debug_read;
 		entry->c.text.write_size = 64;
 		entry->c.text.write = snd_pcm_xrun_debug_write;
+		entry->mode |= S_IWUSR;
 		entry->private_data = pstr;
 		if (snd_info_register(entry) < 0) {
 			snd_info_free_entry(entry);

sound/core/pcm_memory.c

@@ -204,6 +204,7 @@ static int snd_pcm_lib_preallocate_pages1(snd_pcm_substream_t *substream,
 		entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
 		entry->c.text.write_size = 64;
 		entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
+		entry->mode |= S_IWUSR;
 		entry->private_data = substream;
 		if (snd_info_register(entry) < 0) {
 			snd_info_free_entry(entry);