block: replace g_new0 with g_new for bottom half allocation.
This saves about 15% of the clock cycles spent on allocation. Using the slice allocator does not add a visible improvement; allocation is faster than malloc, while freeing seems to be slower. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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