Rewrite init_cmdbuf to dynamically allocate a large enough buffer
to hold the client's commandline.
Also eliminate the check that a client arg could be NULL. This cannot
be (see VG_(split_up_argv) ).


git-svn-id: svn://svn.valgrind.org/valgrind/branches/BUF_REMOVAL@14337 a5019735-40e9-0310-863c-91ae7b9d1cf9
Make print_fd a local variable. The assignment in print_bbcs was a
dead assignment because the variable is being unconditionally assigned
in print_bbccs_of_thread which is the only other function to use that
variable.


git-svn-id: svn://svn.valgrind.org/valgrind/branches/BUF_REMOVAL@14338 a5019735-40e9-0310-863c-91ae7b9d1cf9