iscsi: fix -ENOSPC in iscsi_create()

the -ENOPSC case did not work due to the missing goto.

Reported-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

block/iscsi.c

@@ -1272,6 +1272,7 @@ static int iscsi_create(const char *filename, QEMUOptionParameter *options)
     }
     if (bs.total_sectors < total_size) {
         ret = -ENOSPC;
+        goto out;
     }
 
     ret = 0;