[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/pci/emu10k1/emu10k1x.c

@@ -1075,6 +1075,7 @@ static int __devinit snd_emu10k1x_proc_init(emu10k1x_t * emu)
 		snd_info_set_text_ops(entry, emu, 1024, snd_emu10k1x_proc_reg_read);
 		entry->c.text.write_size = 64;
 		entry->c.text.write = snd_emu10k1x_proc_reg_write;
+		entry->mode |= S_IWUSR;
 		entry->private_data = emu;
 	}