rgw_main.cc: remove dead assignment and unused variable

Fix for:

[src/rgw/rgw_main.cc:1086]: (style) Variable 'frontend_frameworks' is
 assigned a value that is never used.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
rgw_rados.cc: remove dead assignment / unused variable 'obj_name'

Fix for:
[src/rgw/rgw_main.cc:1086]: (style) Variable 'frontend_frameworks'
 is assigned a value that is never used.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>