Remove some unneded checks as identified by IBM's BEAM checker.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14518 a5019735-40e9-0310-863c-91ae7b9d1cf9
Add a missing break as identified by IBM's BEAM checker.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14519 a5019735-40e9-0310-863c-91ae7b9d1cf9