[Libvir] 1/8 remove useless "if (foo)" tests

[Richard W.M. Jones]

Jim Meyering wrote:
> Given code like if (foo) free (foo); remove the useless "if (foo) " part.
> 
> Likewise, given if (foo != NULL) free (foo); remove the useless "if" test.

ACK.

Rich.

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