iohandler: Use bool for boolean struct member and remove holes

Using bool reduces the size of the structure and improves readability.
Two holes in the structure were removed.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

iohandler.c

@@ -33,13 +33,13 @@
 #endif
 
 typedef struct IOHandlerRecord {
-    int fd;
     IOCanReadHandler *fd_read_poll;
     IOHandler *fd_read;
     IOHandler *fd_write;
-    int deleted;
     void *opaque;
     QLIST_ENTRY(IOHandlerRecord) next;
+    int fd;
+    bool deleted;
 } IOHandlerRecord;
 
 static QLIST_HEAD(, IOHandlerRecord) io_handlers =