Fix exit command in check_doxygen shell script.
Fix exit command in check_doxygen shell script.

agrawalabhishek/d2d,openastro/d2d,openastro/d2d,ennehekma/d2d,agrawalabhishek/d2d,agrawalabhishek/d2d,ennehekma/d2d,kartikkumar/d2d,openastro/d2d,kartikkumar/d2d,ennehekma/d2d,kartikkumar/d2d