chgrp :: error in printing with -c option and --reference option

[Alexander Zynevich]

Output of folowing TEXT 1 contains "(null)" where
"root" is expexted to be like in TEXT 2 (hello2.txt is
under root group):

TEXT1
address@hidden /root]# chgrp -c users hello.txt
group of hello.txt changed to users
address@hidden /root]# chgrp -c
--reference=hello2.txt hello.txt
group of hello.txt changed to (null)

TEXT2
address@hidden /root]# chgrp -c users hello.txt
group of hello.txt changed to users
address@hidden /root]# chgrp -c root hello.txt
group of hello.txt changed to root



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