bin/xbps-pkgdb/check.c: fix assertion due to double free.
bin/xbps-pkgdb/check.c: fix assertion due to double free.

datenwolf/xbps,datenwolf/xbps,ebfe/xbps,ebfe/xbps,stpx/xbps,stpx/xbps,datenwolf/xbps,stpx/xbps,ebfe/xbps