memory: rename PORTIO_END to PORTIO_END_OF_LIST

For consistency with other _END_OF_LIST macros.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/memory.h b/memory.h
index 4e518b2..da00a3b 100644
--- a/memory.h
+++ b/memory.h
@@ -133,7 +133,7 @@
     IOPortWriteFunc *write;
 };
 
-#define PORTIO_END { }
+#define PORTIO_END_OF_LIST() { }
 
 /**
  * memory_region_init: Initialize a memory region