qga: Rewrite code where using readdir_r
If readdir_r fails, error_setg_errno will reference the freed pointer *dirpath*. Moreover, readdir_r may cause a buffer overflow, using readdir instead. Signed-off-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Cc: qemu-stable@nongnu.org Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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