connection: reset connnection->pair to PAIR_NONE instead of NULL
connection: reset connnection->pair to PAIR_NONE instead of NULL

yusiwen/libmpdclient,sl0th/libmpdclient,sl0th/libmpdclient,psych0tik/libmpdclient2,jagleeso/libmpdclient,yusiwen/libmpdclient,jwise/libmpdclient,cmende/libmpdclient,sl0th/libmpdclient,jagleeso/libmpdclient,cmende/libmpdclient,psych0tik/libmpdclient2,OpenInkpot-archive/iplinux-libmpdclient,jwise/libmpdclient,jagleeso/libmpdclient,OpenInkpot-archive/iplinux-libmpdclient,cmende/libmpdclient,yusiwen/libmpdclient,jwise/libmpdclient