alg/glseqbrowser.cpp:127: error: jump to case label

Fixes the following:
alg/glseqbrowser.cpp: In member function oid GlSeqBrowser::processSelection(GLuint, GLuint*, GLuint, const GlSeqBrowser::rect<float>&)
alg/glseqbrowser.cpp:127: error: jump to case label
alg/glseqbrowser.cpp:120: error:  crosses initialization of nt rightalg/glseqbrowser.cpp:119: error:  crosses initialization of nt leftalg/glseqbrowser.cpp: In member function oid GlSeqBrowser::copySelectedTracks(std::string&, std::string (*)(const Sequence&, int, int))
alg/glseqbrowser.cpp:399: warning: comparison between signed and unsigned integer expressions
make: *** [glseqbrowser.o Error 1