fix ship sounds when in observer mode
(bug was introduced in revision 7923)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9896 387891d4-d844-0410-90c0-e4c51a9137d3
Coverity: more out-of-bounds fixes

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9897 387891d4-d844-0410-90c0-e4c51a9137d3
remove gcc warnings [-Wunused-but-set-variable] in fs2netd/fs2netd_client.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9898 387891d4-d844-0410-90c0-e4c51a9137d3