block/qcow2-cluster.c: Fix integer left shift error in qcow2_alloc_cluster_link_l2() · Pull Request !1634 · openEuler/qemu

#ID2O2U 
block/qcow2-cluster.c: Fix integer left shift error in qcow2_alloc_cluster_link_l2()

This Patch came from Commit 348fcc4 and was adapted:
    https://github.com/qemu/qemu/commit/348fcc4f7ace1718006e646078d88c8cd8c1d97e
    
    When calculating the offset, the result of left shift operation will be promoted
    to type int64 automatically because the left operand of + operator is uint64_t.
    but the result after integer promotion may be produce an error value for us and
    trigger the following asserting error.
    
    For example, consider i=0x2000, cluster_bits=18, the result of left shift
    operation will be 0x80000000. Cause argument i is of signed integer type,
    the result is automatically promoted to 0xffffffff80000000 which is not
    we expected
    
    The way to trigger the assertion error:
      qemu-img create -f qcow2 -o preallocation=full,cluster_size=256k tmpdisk 10G
    
    This patch fix it by casting @i to uint64_t before doing left shift operation

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