memory: rename PORTIO_END to PORTIO_END_OF_LIST

For consistency with other _END_OF_LIST macros.
Signed-off-by: NAvi Kivity <avi@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

memory.h

@@ -133,7 +133,7 @@ struct MemoryRegionPortio {
     IOPortWriteFunc *write;
 };
 
-#define PORTIO_END { }
+#define PORTIO_END_OF_LIST() { }
 
 /**
  * memory_region_init: Initialize a memory region