Rename variable name to avoid confusion

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Blame previous version with correct old filename when follow renames is enabled

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Show the filename of that line

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>