[PATCH] turn many #if $undefined_string into #ifdef $undefined_string

turn many #if $undefined_string into #ifdef $undefined_string to fix some
warnings after -Wno-def was added to global CFLAGS

Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/net/amd8111e.c b/drivers/net/amd8111e.c
index 8618012..d9ba8be 100755
--- a/drivers/net/amd8111e.c
+++ b/drivers/net/amd8111e.c
@@ -1290,7 +1290,7 @@
 	writel(intr0, mmio + INT0);
 
 	/* Check if Receive Interrupt has occurred. */
-#if CONFIG_AMD8111E_NAPI
+#ifdef CONFIG_AMD8111E_NAPI
 	if(intr0 & RINT0){
 		if(netif_rx_schedule_prep(dev)){
 			/* Disable receive interupts */