hulk inclusion
category: performance
bugzilla: 11028
CVE: NA

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For exampe, if we have 3 regions which is [a, b] [c, d] [e, f]
if address of pfn is bigger than the end address of last region,
we will increse early_region_idx to count of region, which is out
of bound of the regions. Fix this by check the early_region_idx if
equals count of region.
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Nzhong jiang <zhongjiang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>