[ALSA] Fix mask to stop AT91 SSC clock on shutdown

This patch by Frank Mandarino and Hubert Kahlert fixes a bug in the AT91
SSC (i2s) shutdown code that would erroneously disable other AT91
peripheral clocks.

Signed-off-by: Hubert Kahlert <[e-mail]>
Signed-off-by: Frank Mandarino <[e-mail]>
Signed-off-by: Liam Girdwood <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>
Signed-off-by: Jaroslav Kysela <[e-mail]>

sound/soc/at91/at91rm9200-i2s.c

···
 	if (!ssc_p->dir_mask) {
 		/* Shutdown the SSC clock. */
 		DBG("Stopping pid %d clock\n", ssc_p->pid);
-		at91_sys_write(AT91_PMC_PCDR, ssc_p->pid);
+		at91_sys_write(AT91_PMC_PCDR, 1<<ssc_p->pid);
 
 		if (ssc_p->initialized)
 			free_irq(ssc_p->pid, ssc_p);