exec: add parameter errp to qemu_ram_alloc and qemu_ram_alloc_from_ptr
Add parameter errp to qemu_ram_alloc and qemu_ram_alloc_from_ptr so that we can handle errors. Signed-off-by: NHu Tao <hutao@cn.fujitsu.com> Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com> [Assert ptr != NULL in memory_region_init_ram_ptr. - Paolo] Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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