[PATCH] adduser is broken in 1.6.x

[Natanael Copa]

Hi,

adduser fails to create the user when ENABLE_FEATURE_CLEAN_UP is
disabled.

The reason is that adduser will exec passwd without first flushing the
previously written /etc/passwd (and /etc/shadow). passwd will fail
because the user does not exist until files are flushed. But the flush
never comes because the buffered file handles are lost in the exec
operation.

Attatched patch fixes this.

Natanael Copa

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