ramblocks: No more being lazy about duplicate names

Now that we have a working qemu_ram_free() and the primary runtime
user of it has been updated, don't be lenient about duplicate id strings.
We also shouldn't need to create them ondemand at the target.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/arch_init.c b/arch_init.c
index 2f082f3..47bb4b2 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -369,8 +369,9 @@
                     }
 
                     if (!block) {
-                        if (!qemu_ram_alloc(NULL, id, length))
-                            return -ENOMEM;
+                        fprintf(stderr, "Unknown ramblock \"%s\", cannot "
+                                "accept migration\n", id);
+                        return -EINVAL;
                     }
 
                     total_ram_bytes -= length;