[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/isa-bridge.c b/arch/powerpc/kernel/isa-bridge.c
index ee172aa..d73551d 100644
--- a/arch/powerpc/kernel/isa-bridge.c
+++ b/arch/powerpc/kernel/isa-bridge.c
@@ -99,7 +99,7 @@
 	 */
 	if ((pci_addr != 0) || (isa_addr != 0)) {
 		printk(KERN_ERR "unexpected isa to pci mapping: %s\n",
-		       __FUNCTION__);
+		       __func__);
 		return;
 	}