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Use vzalloc() instead of vmalloc() and memset(0) to simpify the code.

Link: https://lore.kernel.org/r/20210518132018.1312995-1-yangyingliang@huawei.com

Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>