[SSSD] [PATCH] Fix chpass operations with LDAP provider

[Stephen Gallagher]

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The initial verification of the old password was returning an
error because we were not explicitly setting dp_err to
DP_ERR_SUCCESS and it was initialized earlier in the function to
DP_ERR_FATAL.

Pushing this to master and sssd-1-2 under the one-liner rule.

- -- 
Stephen Gallagher
RHCE 804006346421761

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