maybe a bug for dname_to_string function

Hi,I read the dname_to_string function, it use a static buffer as a return value, so if I like a code like as following. the output would be wrong.
code for wrong output.
dname_type *d1;
dname_type *d2;
log_msg(LOG_INFO, "%s, %s",  dname_to_string(d1), dname_to_string(d2) );
now, the output which have two dname is repeated,even if the variable d1 and variable d2 have different domain name.

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