ALSA: es1968: Clear interrupts before enabling them

Avoid spurious interrupts when initializing the device.

Signed-off-by: Ville Syrjälä <syrjala@sci.fi>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index aa973ce..23a58f0 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -2401,6 +2401,7 @@
 	w = ESM_HIRQ_DSIE | ESM_HIRQ_HW_VOLUME;
 	if (chip->rmidi)
 		w |= ESM_HIRQ_MPU401;
+	outb(w, chip->io_port + 0x1A);
 	outw(w, chip->io_port + ESM_PORT_HOST_IRQ);
 }