Suppress a clang warning about an uninitialised variable.
Fixes BZ #329694.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14092 a5019735-40e9-0310-863c-91ae7b9d1cf9
Make error message more precise.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14093 a5019735-40e9-0310-863c-91ae7b9d1cf9