xbps-checkvars: add missing assertions after memory allocations
xbps-checkvars: add missing assertions after memory allocations

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