…AX_MATCHES

When color is enable grep(1) searches for MAX_MATCHES, prints the line and then
repeats these steps again untill all matches in the line are found. The issue
is that every time grep(1) prints the whole line which leads to the situation
when line is duplicated (tripled, quadruple, ...) in stdout.

Bug can be reproduced with the next simple command. It prints line twice when
only single line is expected.

$ for i in $(seq 33); do echo -n "foobar"; done | ./grep --color=auto foo

…CHES