util: fix wrong comparison inside virStoragePermsCopy()
VIR_STRDUP returns -1 if the string copy was not successful. So, the
current comparison/logic is throwing an error when VIR_STRDUP() returns
1. Only when source is NULL, it is considering as a success which is
not right.
Signed-off-by: NJulio Faracco <jcfaracco@gmail.com>
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