Fix Coverity #1224005 Negative array index read

git-svn-id: svn://svn.icculus.org/fs2open@10847 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity #1224006 Uninitialized scalar variable in nebl_generate_section()

git-svn-id: svn://svn.icculus.org/fs2open@10848 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity #1093783 Uninitialized scalar variable in gr_opengl_set_center_alpha()

git-svn-id: svn://svn.icculus.org/fs2open@10849 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity #1093544 Negative array index read in multi_ts_handle_mouse()

git-svn-id: svn://svn.icculus.org/fs2open@10850 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity #1093720 Negative array index read in ai_big_maybe_follow_subsys_path()

git-svn-id: svn://svn.icculus.org/fs2open@10851 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity #1093715 Negative array index read in maybe_weapon_detonate()

git-svn-id: svn://svn.icculus.org/fs2open@10852 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity #1093711 Negative array index read in event_music_enemy_arrival()

git-svn-id: svn://svn.icculus.org/fs2open@10853 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity #1093707 Negative array index read in start_ship_animation()

git-svn-id: svn://svn.icculus.org/fs2open@10854 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity #1093706 Negative array index read in scoring_eval_kill_on_weapon()

git-svn-id: svn://svn.icculus.org/fs2open@10855 387891d4-d844-0410-90c0-e4c51a9137d3