xbps-bin: return proper error value if update target fails.
xbps-bin: return proper error value if update target fails.

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