[POWERPC] Replace remaining __FUNCTION__ occurrences

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index e2e78d9..eb3beea 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -507,7 +507,7 @@
 			break;
 		default:
 			printk(KERN_ERR "%s: unexpected RTAS error %d\n",
-					__FUNCTION__, rtas_rc);
+					__func__, rtas_rc);
 			rc = -ERANGE;
 			break;
 	}