isdn: replace remaining __FUNCTION__ occurrences

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/isdn/hisax/elsa.c b/drivers/isdn/hisax/elsa.c
index 2c3691f..aa29d1c 100644
--- a/drivers/isdn/hisax/elsa.c
+++ b/drivers/isdn/hisax/elsa.c
@@ -937,7 +937,7 @@
 					err = pnp_activate_dev(pnp_d);
 					if (err<0) {
 						printk(KERN_WARNING "%s: pnp_activate_dev ret(%d)\n",
-							__FUNCTION__, err);
+							__func__, err);
 						return(0);
 					}
 					card->para[1] = pnp_port_start(pnp_d, 0);