git gui: fix staging a second line to a 1-line file
-rwxr-xr-x 1813 GIT-VERSION-GEN
-rw-r--r-- 11731 Makefile
-rwxr-xr-x 1372 git-gui--askpass
-rwxr-xr-x 101586 git-gui.sh
drwxr-xr-x - lib
drwxr-xr-x - macosx
drwxr-xr-x - po
drwxr-xr-x - windows