generatePassphraseFile: rewrite not to look like a variable-sized buffer
generatePassphraseFile: rewrite not to look like a variable-sized buffer

GCC doesn't see len is set right before, so constant.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb