Fix qemu_eventfd compile when !CONFIG_EVENTFD

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/osdep.c b/osdep.c
index 9e4b17b..5bf3c00 100644
--- a/osdep.c
+++ b/osdep.c
@@ -289,9 +289,9 @@
  */
 int qemu_eventfd(int fds[2])
 {
+#ifdef CONFIG_EVENTFD
     int ret;
 
-#ifdef CONFIG_EVENTFD
     ret = eventfd(0, 0);
     if (ret >= 0) {
         fds[0] = ret;