ALSA: use KBUILD_MODNAME for request_irq argument in sound/pci/*

The name argument of request_irq() appears in /proc/interrupts, and
it's quite ugly when the name entry contains a space or special letters.
In general, it's simpler and more readable when the module name appears
there, so let's replace all entries with KBUILD_MODNAME.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ctxfi/cthw20k2.c b/sound/pci/ctxfi/cthw20k2.c
index 5364164..64f9ded 100644
--- a/sound/pci/ctxfi/cthw20k2.c
+++ b/sound/pci/ctxfi/cthw20k2.c
@@ -1925,7 +1925,7 @@
 
 	if (hw->irq < 0) {
 		err = request_irq(pci->irq, ct_20k2_interrupt, IRQF_SHARED,
-				  "ctxfi", hw);
+				  KBUILD_MODNAME, hw);
 		if (err < 0) {
 			printk(KERN_ERR "XFi: Cannot get irq %d\n", pci->irq);
 			goto error2;