tap: Permit incremental conversion of tap_open() to Error

Convert the trivial ones immediately: tap-aix and tap-haiku.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1431691143-1015-11-git-send-email-armbru@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/net/tap-solaris.c b/net/tap-solaris.c
index 7839323..079046b 100644
--- a/net/tap-solaris.c
+++ b/net/tap-solaris.c
@@ -174,8 +174,9 @@
 }
 
 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
-             int vnet_hdr_required, int mq_required)
+             int vnet_hdr_required, int mq_required, Error **errp)
 {
+    /* FIXME error_setg(errp, ...) on failure */
     char  dev[10]="";
     int fd;
     if( (fd = tap_alloc(dev, sizeof(dev))) < 0 ){